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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: The Journal of the American Medical Association302 (10): 1092–96. doi:10.1001/jama.2009.1307. பப்மெட்:19738094.
Falagas, M. E.; Pitsouni, E. I.; Malietzis, G. A.; Pappas, G. (2007). "Comparison of PubMed, Scopus, Web of Science, and Google Scholar: Strengths and weaknesses". The FASEB Journal22 (2): 338–42. doi:10.1096/fj.07-9492LSF. பப்மெட்:17884971.
pubmedcentral.nih.gov
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