Kulkarni، A. V.؛ Aziz، B.؛ Shams، I.؛ Busse، J. W. (2009). "Comparisons of Citations in Web of Science, Scopus, and Google Scholar for Articles Published in General Medical Journals". JAMA. ج. 302 ع. 10: 1092–6. DOI:10.1001/jama.2009.1307. PMID:19738094.
Kulkarni، A. V.؛ Aziz، B.؛ Shams، I.؛ Busse، J. W. (2009). "Comparisons of Citations in Web of Science, Scopus, and Google Scholar for Articles Published in General Medical Journals". JAMA. ج. 302 ع. 10: 1092–6. DOI:10.1001/jama.2009.1307. PMID:19738094.