Database
Proquest Ebook Central Academic Complete
48
EBSCO Open Access Journals
29
DOAJ: Directory of Open Access Journals
23
EBSCOhost Ebook Collection
21
PubMed Central (PMC) Open Access
20
ScienceDirect
17
Springer Complete eBooks
7
ScienceDirect Open Access Titles
5
Springer Nature Complete Journals
5
Hindawi Open Access Journals
3
Academic Search Premier
2
Oxford University Press
2
Revista de endocrinologia y nutricion
2
Springer Complete Nature.com
2
Springer e-books
2
SpringerLink Journals Fully Open Access
2
Bentham Open - Journals
1
BioMed Central
1
Books at JSTOR
1
De Gruyter Open Journals
1
Frontiers Journal Series (Open Access)
1
Springer eBooks
1
Wiley Online Library Open Access
1