Timbergen, N. (1972). Conducta animal. Time Life.
Lua i Stíl Chicago (17ú heag.)Timbergen, Niko. Conducta Animal. México, D.F: Time Life, 1972.
Lua MLA (9ú heag.)Timbergen, Niko. Conducta Animal. Time Life, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.