Database
EBSCOhost Ebook Collection
38
Proquest Ebook Central Academic Complete
26
Springer Complete eBooks
8
DOAJ: Directory of Open Access Journals
5
Environment Complete
5
Wiley Online Library Database Model
4
Academic Video Online
3
Wiley-Blackwell Backfiles (PALCI)
3
EBSCO Open Access Journals
2
PubMed Central (PMC) Open Access
2
ScienceDirect
2
Academic Search Premier
1
Books at JSTOR
1
Books at JSTOR: Open Access
1
Ciencia
1
ScienceDirect Open Access Titles
1
Springer Nature Complete Journals
1