DOAB Directory of Open Access Books
2013
Books at JSTOR: Open Access
2013
Springer Nature Link eBooks - Fully Open Access
2026
ScienceDirect
2018
OAPEN (Open Access Publishing in European Networks)
2025
DOAB Directory of Open Access Books
2025
Springer Nature Link eBooks - Fully Open Access
2025
ScienceDirect
2026
ScienceDirect
2025
ScienceDirect
1995
ScienceDirect
2026
DOAB Directory of Open Access Books
2016
DOAB Directory of Open Access Books
2009