Portais internacionais de acesso a livros gratuitos

DOAB – Directory of Open Access Books

Acesse aqui 

Manybooks

Acesse aqui 

IALS – Institute of Advanced Legal Studies

Acesse aqui  

BASE - Biellfeld Academic Search Engine

Acesse aqui  

OATD - Open Acess Theses and Dissertations

Acesse aqui