Warren E. Johnson,, Eduardo Eizirik, Jill Pecon-Slattery, William J. Murphy, Agostinho Antunes, Emma Teeling, Stephen J. O'Brien. 2006-01-06. The Late Miocene Radiation of Modern Felidae: A Genetic Assessment. Science, vol. 311 no. 5757 pp. 73-77. DOI: 10.1126/science.1122277. Besøkt 2013-10-12
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Stephen J. O'Brien, Joan C. Menninger, William G. Nash. 2006-04-14. Atlas of Mammalian Chromosomes. John Wiley & Sons, 14. apr. 2006 - 544 sider. Besøkt 2015-12-21