ACM Digital Library

http://portal.acm.org/dl.cfm

Biblioteca Virtual em Saúde

http://www.bireme.br/

Plos - Public Library of Science

http://www.plos.org/

Porbase - Biblioteca Nacional de Dados Bibliográficos

http://porbase.bnportugal.pt/#focus

The Cochrane Collaboration

http://www.cochrane.org/

The WWW Virtual Library

http://vlib.org/

UK Pubmed Central

http://ukpmc.ac.uk/

Web of Knowledge

http://wokinfo.com

Wiley Online Library

http://onlinelibrary.wiley.com/

World Health Organization

http://dosei.who.int/