Rothfels, N. How the caged bird sings: Animals and entertainment / Nigel Rothfels. A cultural history of animals in the age of empire.(2007).
Lua i Stíl Chicago (17ú heag.)Rothfels, Nigel. "How the Caged Bird Sings: Animals and Entertainment / Nigel Rothfels." A Cultural History of Animals in the Age of Empire.(2007) .
Lua MLA (8ú heag.)Rothfels, Nigel. "How the Caged Bird Sings: Animals and Entertainment / Nigel Rothfels." A Cultural History of Animals in the Age of Empire.(2007), .
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.