DOAB Directory of Open Access Books
2025
DOAB Directory of Open Access Books
2021
ScienceDirect
2019
DOAJ: Directory of Open Access Journals
2019-01-01 ~ 현재
DOAB Directory of Open Access Books
2025
ScienceDirect
2006
ScienceDirect
2019
ScienceDirect
2023-06-01 ~ 현재
ScienceDirect Open Access Titles
2023-06-01 ~ 현재
Books at JSTOR: Open Access
2025
Project Muse Open Access ebooks
2025
Taylor & Francis Open
2015-01-01 ~ 2017-12-31