The PKP Index is a database of articles, books, and conference proceedings using PKP's free, open source Open Journal Systems, Open Monograph Press, and Open Conference Systems software applications. The PKP Index includes 638878 records indexed from 2598 publications.

 Crossref (formerly styled CrossRef) is an official Digital Object Identifier (DOI) Registration Agency of the International DOI Foundation. It is run by the Publishers International Linking Association Inc. (PILA) and was launched in early 2000 as a cooperative effort among publishers to enable persistent cross-publisher citation linking in online academic journals.

 Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines. Released in beta in November 2004, the Google Scholar index includes most peer-reviewed online academic journals and books, conference papers, theses and dissertations, preprints, abstracts, technical reports, and other scholarly literature, including court opinions and patents.

 Trove is a collaboration between the National Library of Australia and hundreds of Partner organisations around Australia.

 Academia.edu is a for-profit American social networking website for academics. The platform can be used to share papers, monitor their impact, and follow the research in a particular field. It was launched in September 2008, with 36 million unique visitors per month as of December 2017 and over 20 million uploaded texts.

 ResearchBib is open access with high standard indexing database for researchers and publishers. Research Bible may freely index journals, research papers, call for papers, research position.

 ISJD is a directory of Indonesian scientific journal managed by LIPI (Research Center of Indonesia).

 Directory of Research Journal Index provides ready access to education literature to support the use of educational research and information to improve practice in learning, teaching, educational decision-making, and research. Directory of Research Journals Indexing is a free online service that helps you to find web resources for your articles and research. With millions of resources available on the Internet, it can be difficult to find useful material. We have reviewed and evaluated thousands of resources to help you choose key websites in your subject. Our indexed journals will be submitted to all social networks and world's top most indexing and they will be displayed on world's top electronic library. In short, all journals will reach all continents.

 WorldCat is a union catalog that itemizes the collections of 72,000 libraries in 170 countries and territories that participate in the Online Computer Library Center (OCLC) global cooperative. It is operated by OCLC Online Computer Library Center, Inc. The subscribing member libraries collectively maintain WorldCat's database, the world's largest bibliographic database.

 ROAD, the Directory of Open Access scholarly Resources, is a service offered by the ISSN International Centre with the support of the Communication and Information Sector of UNESCO. Launched as a beta version on 16th December 2013.

 Indonesia OneSearch or IOS is a continuously evolving search portal for all public materials from Indonesian libraries, museums, and archives. IOS also provides access to the subscribed e-resources for all registered members. It is a featured program by the National Library of Indonesia.

 The OpenAIRE Research Graph is one of the largest open scholarly record collections worldwide, key in fostering Open Science and establishing its practices in the daily research activities. Conceived as a public and transparent good, populated out of data sources trusted by scientists, the Graph aims at bringing discovery, monitoring, and assessment of science back in the hands of the scientific community.

 Citefactor, is a service that provides access to quality controlled Open Access Journals. The Directory indexing of journal aims to be comprehensive and cover all open access scientific and scholarly journals that use an appropriate quality control system, and it will not be limited to particular languages or subject areas. The aim of the Directory is to increase the visibility and ease of use of open access scientific and scholarly journals thereby promoting their increased usage and impact.

 BASE is one of the world's most voluminous search engines especially for academic web resources. BASE provides more than 100 million documents from more than 5,000 sources. You can access the full texts of about 60% of the indexed documents for free (Open Access). BASE is operated by Bielefeld University Library.

 The Garba Rujukan Digital (GARUDA) is a powerful resource platform for discovery of scholarly publications in Indonesia managed by Ministry of Research, Technology and Higher Education of the Republic of Indonesia (Kemenristekdikti). GARUDA is a comprehensive database, covering all subjects from arts & humanities, behavioral sciences and social sciences to medicine & pharmacology, physical sciences, engineering, mathematics & computer science, chemistry and biology. It is designed for browsing, indexing, abstracting, monitoring and improving the standard of scholarly publications in Indonesia that is essential for researchers, lecturers, students, librarians, regulators and policy makers. Using a wide range of resources, including Indonesian journals and conference proceedings, researchers can improve productivity and facilitate important discoveries with GARUDA. Save time and access relevant information in a convenient, fast, and reliable way using the leading scientific and technical content discovery platform.

 The Index Copernicus International (ICI) Journals Master List is an international indexation database of scientific journals. In order to be indexed, the journal needs to successfully pass the evaluation process involving a multidimensional parametric evaluation based on more than 100 criteria. Journals which successfully pass the parametric evaluation are awarded the ICV (Index Copernicus Value) index – valid for one year only – which reflects the development level of the journal and its impact range.

 Dimensions is a linked research knowledge system that re-imagines discovery and access to research. Developed by Digital Science in collaboration with over 100 leading research organizations around the world, Dimensions brings together grants, publications, citations, alternative metrics, clinical trials, patents and policy documents to deliver a platform that enables users to find and access the most relevant information faster, analyze the academic and broader outcomes of research, and gather insights to inform future strategy.

 ScienceGate Academic Search Engine . Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery. With over 15,000 journals across 10 research areas, just choose which journals you want to follow and we'll create you a personalised feed and it's free.

 Universiteit Leiden. The libraries of Social and Behavioral Sciences, Law, Archeology and Mathematics and Natural Sciences, the Asian Library, the NINO Library and the Wijnhaven Library in The Hague. The Academic Historical Museum is part of UBL. In the Leiden University Medical Centre (LUMC) you can find the Walaeus Library for medical studies. This library has close ties with the UBL, but is not a part of the organisation. Furthermore UBL has two offices in Jakarta (Indonesia) and in Rabat (Morocco).

 InaSTI Indonesian Science and Technology Index.

 Library of Congress Catalog The user interface to the LC Catalog incorporates responsive web design, which enables optimal viewing and interaction across a wide range of devices. Responsive design provides easy reading and navigation with a minimum of resizing, panning, and scrolling, regardless of the size of the device, from desktop computer monitors to mobile phones, tablets, etc. LC's web metrics show that more and more users are accessing the Library's web properties from smart phones or tablets. Responsive design is inherently accessible, that is, ADA-compliant making the LC Catalog accessible to all users including those with disabilities.

 The National Library of Australia Catalogue. The Library serves the Australian people through the maintenance and development of a comprehensive reference collection and a rich collection of material related to Australians and Australia.

  Scientific Indexing Service (SIS). The International Companies and Publications Can be one of the SIS Representatives around the world.

 Eurasian Scientific Journal Index is a journal indexing and impact Factor Calculation service based on Eurasian Citation Reports and Eurasian Scientific Index.

 BibMe may be very helpful in automating the process of creating and formatting citations, it’s still important that students understand how to cite sources “the old-fashioned way.” Knowing the rules and guidelines that each style guide outlines is an important part of writing a paper and compiling a bibliography. Using our citation guides, you can look up the formatting guidelines and rules for all the source types we support for the MLA, APA and Chicago/Turabian style guides.

 The University of Washington Libraries is a user-centered academic library with rich collections,collaborations and partnerships.

 Mendeley is a free reference manager and academic social network that can help you organize your research, collaborate with others online, and discover the latest research.

 World Catalogue of Scientific Journals or a list of the most known and prestigious scientific journals, is intended to promote science and education worldwide. The system of science and education promotion as a free-of-charge and generally available offer can be and is presented in the form of an on-line system.

 Peer Library Find the articles you’re looking for, Explore related research, and Organize your library and your thoughts.