ScienceDirect
2019
DOAB Directory of Open Access Books
2023
ScienceDirect
2016
ScienceDirect
1980
ScienceDirect
2017
ScienceDirect
2018
DOAJ: Directory of Open Access Journals
2021-01-01 ~ 현재
ScienceDirect
2019
EBSCO Open Access Journals
1915-03-01 ~ 1916-12-31
OAPEN (Open Access Publishing in European Networks)
2021
De Gruyter Brill Open Access eBooks
2021