ScienceDirect
2019
DOAB Directory of Open Access Books
2020
DOAB Directory of Open Access Books
2020
DOAB Directory of Open Access Books
2020
DOAB Directory of Open Access Books
2011
ScienceDirect
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DOAB Directory of Open Access Books
2021
DOAJ: Directory of Open Access Journals
2014-01-01 ~ 현재
Springer Nature Link Journals - Fully Open Access
2014-12-01 ~ 현재
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2022
DOAB Directory of Open Access Books
2021
Cambridge Open Access Books and Elements
2021