Hancocks, D. Zoo animals as entertainment exhibitions: David Hancocks. A cultural history of animals in the modern age.(2007).
Lua i Stíl Chicago (17ú heag.)Hancocks, David. "Zoo Animals as Entertainment Exhibitions: David Hancocks." A Cultural History of Animals in the Modern Age.(2007) .
Lua MLA (8ú heag.)Hancocks, David. "Zoo Animals as Entertainment Exhibitions: David Hancocks." A Cultural History of Animals in the Modern Age.(2007), .
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.