Boyd, R., & Silk, J. B. (2006). How humans evolved (4th ed.). Norton.
Lua i Stíl Chicago (17ú heag.)Boyd, Robert, agus Joan B. Silk. How Humans Evolved. 4th ed. New York: Norton, 2006.
Lua MLA (9ú heag.)Boyd, Robert, agus Joan B. Silk. How Humans Evolved. 4th ed. Norton, 2006.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.