Pfeiffer, J. E. (1972). The emergence of man (2nd edition.). Harper & Row.
Lua i Stíl Chicago (17ú heag.)Pfeiffer, John E. The Emergence of Man. 2nd edition. New York: Harper & Row, 1972.
Lua MLA (9ú heag.)Pfeiffer, John E. The Emergence of Man. 2nd edition. Harper & Row, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.