Scopus® (93,233)
MEDLINE (42,993)
Science Citation Index Expanded (16,734)
OAIster (8,881)
Complementary Index (6,036)
Academic Search Complete (4,680)
Supplemental Index (3,438)
IEEE Xplore Digital Library (2,807)
Directory of Open Access Journals (2,489)
ScienceDirect (2,442)
Springer Nature Journals (2,290)
arXiv (1,802)
SwePub (1,715)
Gale Academic OneFile (1,039)
CINAHL Plus with Full Text (996)
Journals@OVID (832)
eScholarship (783)
Social Sciences Citation Index (480)
MathSciNet via EBSCOhost (387)
Gale General OneFile (299)
Business Source Complete (238)
RePEc (220)
JSTOR Journals (202)
J-STAGE (158)
NASA Technical Reports (138)
USPTO Patent Applications (135)
Digital Access to Scholarship at Harvard (DASH) (130)
USPTO Patent Grants (128)
China Online Journals (Wanfang) (91)
Education Source (75)
DBPIA (39)
ACM Full-Text Collection (38)
Korea Citation Index (29)
ERIC (27)
Airiti Library eBooks & Journals - 華藝線上圖書館 (18)
De Gruyter Online (18)
Library, Information Science & Technology Abstracts (14)
BioOne Complete (14)
Oxford Scholarship Online (11)
Korean Studies Information Service System (10)
Emerald Insight (10)
APA PsycArticles (9)
Aerospace Research Central (7)
GeoScienceWorld (5)
Arts & Humanities Citation Index (5)
SciELO (5)
Academic Conferences in China (Wanfang) (4)
Europeana (4)
Communication & Mass Media Complete (4)
ASTM Compass (2)
AccessEngineering (2)
JoVE Journal (2)
AccessScience (2)
스콜라(Scholar) (2)
eArticle (2)
MLA International Bibliography (2)
British Library EThOS (1)
HeinOnline (1)
SveMed+ (1)
SciTech Connect (1)
ProjectMUSE (1)
KERIS Theses & Dissertations (1)
Choice Reviews (1)
Wiley Online Reference Works (1)