Scopus® (137,452)
MEDLINE (61,639)
Science Citation Index Expanded (16,143)
Complementary Index (6,629)
Academic Search Complete (5,446)
Supplemental Index (3,670)
IEEE Xplore Digital Library (3,667)
Directory of Open Access Journals (2,812)
ScienceDirect (2,649)
Springer Nature Journals (1,950)
arXiv (1,710)
CINAHL Plus with Full Text (1,424)
Gale Academic OneFile (1,250)
Journals@OVID (1,040)
SwePub (843)
eScholarship (728)
Gale General OneFile (694)
Social Sciences Citation Index (556)
MathSciNet via EBSCOhost (539)
JSTOR Journals (251)
RePEc (240)
Business Source Complete (220)
USPTO Patent Grants (129)
USPTO Patent Applications (129)
Education Source (95)
NASA Technical Reports (87)
China Online Journals (Wanfang) (77)
ACM Full-Text Collection (73)
Digital Access to Scholarship at Harvard (DASH) (53)
Europeana (42)
J-STAGE (38)
Korea Citation Index (34)
De Gruyter Online (34)
Airiti Library eBooks & Journals - 華藝線上圖書館 (30)
DBPIA (23)
ERIC (20)
ASTM Compass (17)
BioOne Complete (16)
Communication & Mass Media Complete (16)
Wiley Online Reference Works (15)
GeoScienceWorld (12)
OAIster (12)
eArticle (11)
APA PsycArticles (11)
SciTech Connect (10)
Korean Studies Information Service System (9)
Library, Information Science & Technology Abstracts (9)
Arts & Humanities Citation Index (9)
MLA International Bibliography (7)
KERIS Theses & Dissertations (6)
Regional Business News (5)
Aerospace Research Central (5)
Academic Conferences in China (Wanfang) (4)
ProjectMUSE (3)
JoVE Journal (3)
British Library EThOS (2)
Emerald Insight (2)
HeinOnline (1)
Choice Reviews (1)
SciELO (1)
F1000Research (1)
AccessScience (1)
AccessEngineering (1)
Oxford Scholarship Online (1)
SveMed+ (1)