Recursos em acesso livre - Livros Electrónicos e Bibliotecas Digitais

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Bartleby.com

Biblioteca Nacional Digital

Bookyards

Classiques des Sciences Sociales

DOAB - Directory of Open Acess Books

EU Bookshop

Free-ebooks

Human Sciences Research Council Press

Intech Open Science Books

Ler Ebooks

Livros Grátis

OpenEdition Books

OAPEN - Open Access Publishing in European Networks

Pombalina

Project Gutenberg

Questia Free Books

Rand Books - Publications

World Digital Library - Biblioteca Digital Mundial

Europeana

The European Library

Google Books

Biblioteca Digital Camões (Instituto Camões)

GALLICA - Bibliothèque Numérique

Google Scholar

EBSCO - Electronic Journal Services

Wiley - Online Library

Infopédia - Online Library

Dicionário Priberam da Língua Portuguesa

CiberDúvidas da Língua Portuguesa

PubMed - Ciências da saúde

Springer Books / Book Series

UC Pombalina

APA Handbook of Research Methods in Psychology

arXiv.org

AMS Books Online - American Mathematical Society

Bookshelf (NCBI)

DOAB Directory of Open access Books

Free-ebooks.net

Fundação Alexandre de Gusmão (Brasil)

OAPEN

World Bank Open Data Portal

World Bank Open Knowledge Repository (Working Papers anteriores a 2000 disponíveis na World Bank e-Library)