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Table 1 Comparison of features in Web of Science, Scopus, and Google Scholar

From: Three options for citation tracking: Google Scholar, Scopus and Web of Science

  Web of Science Scopus Google Scholar
Indexing and abstracting Yes Yes No
Years covered-journals 1900 to present (Science) 1956-present (Social Science) 1975-present (Arts and Humanities) 1966 to present for some journals, but many date back to 1996 to present Not revealed
Years covered-citations 1900 to present 1996 to present Not revealed
Fee-based Yes Yes No
Contents 9300 journals (Science, Social Science and Arts and Humanities) 15,000 journals (Science and Social Science) Not revealed