Wallace, A. R. (1913). Social environment and moral progress. Cassell and Co..
Lua i Stíl Chicago (17ú heag.)Wallace, Alfred Russel. Social Environment and Moral Progress. London, New York [etc.]: Cassell and Co., 1913.
Lua MLA (8ú heag.)Wallace, Alfred Russel. Social Environment and Moral Progress. Cassell and Co., 1913.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.