O'Malley, A. (1923). Biological Survival and Explanation. Philadelphia.
Lua i Stíl Chicago (17ú heag.)O'Malley, Austin. Biological Survival and Explanation. Philadelphia, 1923.
Lua MLA (8ú heag.)O'Malley, Austin. Biological Survival and Explanation. Philadelphia, 1923.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.