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

•Google Scholar found nearly all citations found by WoS (95%) and Scopus (92%), and a large amount of unique citations.•About half of Google Scholar unique citations are not from journals. A significant minority (19–38%) are not in English.•Google Scholar unique citations have, on average, a much lo...

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Bibliographic Details
Published in:	Journal of informetrics Vol. 12; no. 4; pp. 1160 - 1177
Main Authors:	Martín-Martín, Alberto, Orduna-Malea, Enrique, Thelwall, Mike, Delgado López-Cózar, Emilio
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01.11.2018
Subjects:	Academic search engines Bibliographic databases Bibliometrics Citation analysis Citation overlap Coverage Google Scholar Scientometrics Scopus Unique citations Web of Science Web of Science Unique citations Scientometrics Citation analysis Bibliometrics Scopus Citation overlap Bibliographic databases Coverage Academic search engines Google Scholar
ISSN:	1751-1577, 1875-5879
Online Access:	Get full text
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