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.

Index Copernicus (IC) is an online database of user-contributed information, including scientist profiles, as well as of scientific institutions, publications and projects.

The ISI server provides indexing of major international journals and proceedings. Author can get information about international journal impact factor

ResearchGate is a social networking site for scientists and researchers to share papers, ask and answer questions, and find collaborators.

An e-journal closely resembles a print journal in structure: there is a table of contents which lists the articles, and many electronic journals still use a volume/issue model, although some titles now publish on a continuous basis.

EBSCO is the leading provider of research databases, e-journals, magazine subscriptions, e-books and discovery service to libraries of all kinds.

Scribd is a digital library, e-book and audiobook subscription service that includes one million titles. Scribd hosts 60 million documents on its open publishing platform.

Ulrich's is named after its originator, Carolyn Farquhar Ulrich, the Head of Periodicals at the New York Public Library. Ulrich's was first published in 1932 as " Periodicals Directory: A Classified Guide to a Selected List of Current Periodicals Foreign and Domestic ."

The Max Perutz Library is a specialized reference library, located at the Campus Vienna Biocenter. It maintains and develops literature collections and information services in support of the present and future research and teaching needs of the institutes it serves. The more, it provides a quiet and well-equipped study environment.

The CiteFactor server provides indexing of major international journals and proceedings. Author can get information about international journal impact factor, proceedings (research papers) and information on upcoming events.

PubsHub is a database containing comprehensive details on peer-reviewed medical journals and academic conferences for those interested in scholarly publishing or presentation.

CiteSeerx is an evolving scientific literature digital library and search engine that has focused primarily on the literature in computer and information science.

UNIVERSE DIGITAL LIBRARY is an innovative digital library that contains academic resources of engineering, medical, business, science, islamic and general reference books, theses, dissertations and journals with built in software tools. We structure our digital library and contents for users to progress from simpler to deeper contents and advance their learning journeys, headquartered in Kuala Lumpur, the capital city of Malaysia.