Greene, H. W. (1997). Snakes: The Evolution of Mystery in Nature. University of California.
Lua i Stíl Chicago (17ú heag.)Greene, Harry W. Snakes: The Evolution of Mystery in Nature. Berkeley: University of California, 1997.
Lua MLA (9ú heag.)Greene, Harry W. Snakes: The Evolution of Mystery in Nature. University of California, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.