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Despite citation counts from Google Scholar (GS), Web of Science (WoS), andScopus being widely consulted by researchers and sometimes used in researchevaluations, there is no recent or systematic evidence about the differencesbetween them. In response, this paper investigates 2,448,055 citations to 2,299English-language highly-cited documents from 252 GS subject categoriespublished in 2006, comparing GS, the WoS Core Collection, and Scopus. GSconsistently found the largest percentage of citations across all areas(93%-96%), far ahead of Scopus (35%-77%) and WoS (27%-73%). GS found nearly allthe WoS (95%) and Scopus (92%) citations. Most citations found only by GS werefrom non-journal sources (48%-65%), including theses, books, conference papers,and unpublished materials. Many were non-English (19%-38%), and they tended tobe much less cited than citing sources that were also in Scopus or WoS. Despitethe many unique GS citing sources, Spearman correlations between citationcounts in GS and WoS or Scopus are high (0.78-0.99). They are lower in theHumanities, and lower between GS and WoS than between GS and Scopus. Theresults suggest that in all areas GS citation data is essentially a superset ofWoS and Scopus, with substantial extra coverage.

Google Scholar, Web of Science, and Scopus: a systematic comparison of citations in 252 subject categories