ScienceDirect
1997
ScienceDirect
2009
DOAB Directory of Open Access Books
2025
DOAB Directory of Open Access Books
2026
DOAB Directory of Open Access Books
2022
DOAB Directory of Open Access Books
2018
DOAB Directory of Open Access Books
2018
ScienceDirect
2026
DOAB Directory of Open Access Books
2025
OAPEN (Open Access Publishing in European Networks)
2016
DOAB Directory of Open Access Books
2016
Books at JSTOR: Open Access
2017
Project Muse Open Access ebooks
2016