★ Google Scholar

★ SSRN

★ Chemical Abstracts Service (CAS), USA

★ Ulrich's Periodicals Directory, USA

★ Chinese Database of CEPS, American Federal Computer Library Center (OCLC), USA

★ Chinese Scientific Journals Database, VIP Corporation, Chongqing, China

★ Norwegian Social Science Data Services (NSD), Norway

★ Index Copernicus, Poland

★ China National Knowledge Infrastructure (CNKI), China
★ Universe Digital Library Sdn Bhd (UDLSB), Malaysia

★ PBN (Polish Scholarly Bibliography)
★ RoMEO
★ Electronic Journals Library
★ AcademicKeys
★ CiteFactor (USA)
★ getCITED
★ Newjour
★ Scientific Indexing Services
★ INNO SPACE
★ SJournals