Kulkarni, A. V.; Aziz, B.; Shams, I.; Busse, J. W. «Comparisons of Citations in Web of Science, Scopus, and Google Scholar for Articles Published in General Medical Journals». JAMA, 302, 10, 2009, pàg. 1092–6. DOI: 10.1001/jama.2009.1307. PMID: 19738094.
Kulkarni, A. V.; Aziz, B.; Shams, I.; Busse, J. W. «Comparisons of Citations in Web of Science, Scopus, and Google Scholar for Articles Published in General Medical Journals». JAMA, 302, 10, 2009, pàg. 1092–6. DOI: 10.1001/jama.2009.1307. PMID: 19738094.