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.
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.