Collection
Directory of Open Access Books
194
O'Reilly
137
OECD Books and Papers
117
OAPEN
40
Springer eBooks 2005-
15
National Center for Biotechnology Information
10
JSTOR Open Access Books
6
Edward Elgar eBooks Collection Business & Economics
5
DeGruyter MPG Collection
1
MIT Press Direct to Open
1
Mohr Siebeck eBooks
1