Emerging Sources Citation Index (ESCI)

Scopus

Directory of Open Access Journals (DOAJ)

INSPEC

Cambridge Scientific Abstracts (CSA)

American Chemical Abstracts (CA)

Russian Abstracts Journal (AJ)

China Scientific and Technical Papers and Citation Database (CSTPCD)

Chinese Science Citation Database (CSCD)

J-Gate

GeoRef

Geobase

Petroleum Abstracts

MIAR

Ulrich's Periodicals Directory