DOAJ: Directory of Open Access Journals
2017-01-01 ~ 현재
PubMed Central (PMC)
2024-01-01 ~ 현재
EBSCO Open Access Journals
1993-01-01 ~ 2021-12-31
ScienceDirect
1997
ScienceDirect
1994
ScienceDirect
2026
EBSCO Open Access Journals
1982-01-01 ~ 현재
ScienceDirect
1995
MIT Press Direct to Open Backfile Complete Monographs
2004
DOAB Directory of Open Access Books
2000
ScienceDirect
1974