Directory of Open Access Journal (DOAJ), Sweden

Chemical Abstracts (CA), USA

Abstracts Journal (AJ), Russia

Ulrich's Periodicals Directory (Ulrichweb), USA

European Publications (EuroPub), US

ICI World of Journals, Poland

Open J-Gate, India

China Science and Technology Journal Database, Chongqing VIP

Chinese Academic Journal Comprehensive Evaluation Database (CAJCED)

China Core Journal Alternative Database