DOAB Directory of Open Access Books
2024
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2015
EBSCO Open Access Journals
2012-05-01 ~ 현재
DOAB Directory of Open Access Books
2018
DOAJ: Directory of Open Access Journals
2023-01-01 ~ 현재
Wiley Online Library Open Access
2023-01-01 ~ 현재
DOAB Directory of Open Access Books
2020
DOAB Directory of Open Access Books
2023
DOAJ: Directory of Open Access Journals
2020-01-01 ~ 현재
Wiley Online Library Open Access
2020-01-01 ~ 현재
ScienceDirect
1961-01-01 ~ 1967-12-31
DOAB Directory of Open Access Books
2022