知网(CNKI)国家哲学社会科学文献中心读秀学术开元知海·e读全国期刊联合目录数据库(UNICAT)Academic KeysCALISCNPIECCornell University LibraryGoogle ScholarGold RushJournalseekJournalTOCsOpen Access LibraryOpen J-Gate Polish Scholarly Bibliography (PBN)Research BibleScilitSocial Science Research Network(SSRN)SHERPA/ROMEOWorldcat这些都是