Hartwig, W. (2011). "Chapter 3: Primate evolution". प्रकाशित Campbell, C. J.; Fuentes, A.; MacKinnon, K. C.; Bearder, S. K.; Stumpf, R. M (संपा॰). Primates in Perspective (2nd संस्करण). Oxford University Press. पपृ॰ 19–31. आई॰ऍस॰बी॰ऍन॰978-0-19-539043-8.
Lull, Richard Swann (1917). "XXXVII: The Evolution of Man". Organic Evolution (1929 संस्करण). New York: The Macmillan Company. पपृ॰ 641–86 – वाया Google Books.