An excellent compilation of the best bibliographic portals of magazines, documents and doctoral theses.
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Dialnet - One of the largest bibliographic portals in the world
Dialnet is one of the largest bibliographic portals in the world, whose main task is to give greater visibility to the Hispanic scientific literature.
Focusing primarily on the areas of Human, Legal and Social Sciences, Dialnet is constituted as a fundamental tool for the search of quality information.
Dialnet is a cooperation project that integrates different resources and documentary services.
Google Scholar - Freely accessible web search engine that indexes the full text or metadata of scholarly literature
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. While Google does not publish the size of Google Scholar's database, third-party researchers estimated it to contain roughly 160 million documents as of May 2014 and an earlier statistical estimate published in PLOS ONE using a Mark and recapture method estimated approximately 80-90% coverage of all articles published in English with an estimate of 100 million. This estimate also determined how many documents were freely available on the web.
ScienceDirect - The world's leading source for scientific, technical, and medical research
ScienceDirect is the world's leading source for scientific, technical, and medical research. Explore journals, books and articles.
ScienceDirect is a website which provides subscription-based access to a large database of scientific and medical research. It hosts over 12 million pieces of content from 3,500 academic journals and 34,000 e-books. The journals are grouped into four main sections: Physical Sciences and Engineering, Life Sciences, Health Sciences, and Social Sciences and Humanities. Article abstracts are freely available, but access to their full texts (in PDF and, for newer publications, also HTML) generally require a subscription or pay-per-view purchase.
ERIC - The largest online digital library of education research and information
The Education Resources Information Center (ERIC) is an online digital library of education research and information. ERIC is sponsored by the Institute of Education Sciences of the United States Department of Education. The mission of ERIC is to provide a comprehensive, easy-to-use, searchable, Internet-based bibliographic and full-text database of education research and information for educators, researchers, and the general public. Education research and information are essential to improving teaching, learning, and educational decision-making.
ERIC provides access to 1.5 million bibliographic records (citations, abstracts, and other pertinent data) of journal articles and other education-related materials, with hundreds of new records added every week. A key component of ERIC is its collection of grey literature in education, which is largely available in full text in Adobe PDF format. Approximately one quarter of the complete ERIC Collection is available in full text. Materials with no full text available (primarily journal articles) can often be accessed using links to publisher websites and/or library holdings.
SciELO - Scientific Electronic Library Online
SciELO (Scientific Electronic Library Online) is a bibliographic database, digital library, and cooperative electronic publishing model of open access journals. SciELO was created to meet the scientific communication needs of developing countries and provides an efficient way to increase visibility and access to scientific literature. Originally established in Brazil in 1997, today there are 14 countries in the SciELO network and its journal collections: Argentina, Bolivia, Brazil, Chile, Colombia, Costa Rica, Cuba, Mexico, Peru, Portugal, South Africa, Spain, Uruguay, and Venezuela. Paraguay is developing a journal collection.
SciELO was initially supported by the São Paulo Research Foundation (FAPESP) and the Brazilian National Council for Scientific and Technological Development (CNPq), along with the Latin American and Caribbean Center on Health Sciences Information (BIREME). SciELO provides a portal that integrates and provides access to all of the SciELO network sites. Users can search across all SciELO collections or limit by a single country collection, or browse by subject area, publisher, or journal title.