DOAB Directory of Open Access Books
2026
ScienceDirect
2020
DOAB Directory of Open Access Books
2022
ScienceDirect
2011
ScienceDirect
2022-09-01 ~ 현재
DOAJ: Directory of Open Access Journals
2022-01-01 ~ 현재
ScienceDirect Open Access Titles
2022-09-01 ~ 현재
DOAB Directory of Open Access Books
2011
ScienceDirect
2021
DOAB Directory of Open Access Books
2025
DOAB Directory of Open Access Books
2024
DOAB Directory of Open Access Books
2021