Laing, S. (1892). Human origins. Chapman & Hall.
Lua i Stíl Chicago (17ú heag.)Laing, S. Human Origins. London: Chapman & Hall, 1892.
Lua MLA (8ú heag.)Laing, S. Human Origins. Chapman & Hall, 1892.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.