DOAB Directory of Open Access Books
1996
DOAB Directory of Open Access Books
2020
Books at JSTOR: Open Access
2020
DOAB Directory of Open Access Books
2022
DOAJ: Directory of Open Access Journals
2016-01-01 ~ 현재
DOAJ: Directory of Open Access Journals
2020-01-01 ~ 현재
ScienceDirect
2007
EBSCO Open Access Journals
1998-01-01 ~ 2000-12-31
DOAB Directory of Open Access Books
2024
DOAB Directory of Open Access Books
2011
Project Muse Open Access ebooks
2012
MIT Press Direct eBooks - Open Access
2011
MIT Press Direct to Open Backfile Complete Monographs
2011
ScienceDirect
1988