Wilson, A. (1961). The old men at the zoo. Seeker & Warburg.
Lua i Stíl Chicago (17ú heag.)Wilson, Angus. The Old Men at the Zoo. London: Seeker & Warburg, 1961.
Lua MLA (9ú heag.)Wilson, Angus. The Old Men at the Zoo. Seeker & Warburg, 1961.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.