DOAJ: Directory of Open Access Journals
2019-01-01 ~ 현재
PubMed Central (PMC)
2012-01-01 ~ 현재
Taylor & Francis Open
2012-01-01 ~ 2014-12-31 , 2019-01-01 ~ 현재
DOAB Directory of Open Access Books
2020
ScienceDirect
2012
DOAB Directory of Open Access Books
2020
DOAB Directory of Open Access Books
2018
DOAB Directory of Open Access Books
2019
DOAB Directory of Open Access Books
2025
DOAB Directory of Open Access Books
2023
DOAB Directory of Open Access Books
2020
ScienceDirect
2006