Hesse, R., Allee, W. C., & Schmidt, K. P. (1951). Ecological animal geography (2nd ed.). Wiley.
Lua i Stíl Chicago (17ú heag.)Hesse, Richard, Warder Clyde Allee, agus Karl P. Schmidt. Ecological Animal Geography. 2nd ed. New York: Wiley, 1951.
Lua MLA (9ú heag.)Hesse, Richard, et al. Ecological Animal Geography. 2nd ed. Wiley, 1951.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.