EBSCO Open Access Journals
1998-01-01 ~ 2023-12-31 , 1992-01-01 ~ 1992-12-31
EBSCO Open Access Journals
1988-01-01 ~ 2019-12-31
PubMed Central (PMC)
2021-01-01 ~ 현재
DOAJ: Directory of Open Access Journals
2011-01-01 ~ 현재
DOAJ: Directory of Open Access Journals
2020-01-01 ~ 현재
ScienceDirect
1999-01-01 ~ 현재
ScienceDirect
2010-01-01 ~ 현재
DOAB Directory of Open Access Books
1985
DOAB Directory of Open Access Books
2007
EBSCO Open Access Journals
1995-01-01 ~ 2023-12-31