Database
Proquest Ebook Central Academic Complete
464
EBSCOhost Ebook Collection
414
Springer Complete eBooks
188
Academic Video Online
34
Springer eBooks
16
Springer e-books
12
MIT Press Direct to Open
9
EBSCO Open Access Journals
3
DOAJ: Directory of Open Access Journals
1
Hindawi Open Access Journals
1
IEEE Electronic Library (IEL)
1