WAfrika-Studiecentrum LeidenWArachne (archaeological database)WAstrophysics Data SystemWAuthors Guild, Inc. v. HathiTrustWBARTOCWBASE (search engine)WVirtual Health LibraryWBiography IndexWCentral and Eastern European Online LibraryWChemical Abstracts ServiceWChina Biographical DatabaseWCiNiiWCircumpolar Health Bibliographic DatabaseWCochrane LibraryWDBLPWUniversity of La RiojaWEducation Resources Information CenterWEnergy Technology Data ExchangeWFood Science and Technology AbstractsWGoogle ScholarWHAL (open archive)WInfoTracWInitiative for Open CitationsWLive Search AcademicWMicrosoft AcademicWMicrosoft Academic SearchWNational Science Digital LibraryWNederlandse Centrale CatalogusWOpenCitationsWPANGAEA (data library)WPhilosopher's Information CenterWSciELOWScirusWSerbian Citation IndexWStanford Physics Information Retrieval SystemWTroveWVirtual Health LibraryWWeb of ScienceWWorldCatWFile:Biography Index low res cover.png