Gaya APA

Swanson, C, P., Pope, C, H. (1967). The giant snakes the natural history of the boa contrictor,the anaconda, ì and the largest python . New York: New York: Alfred A. Knopf; 1967.

Gaya MLA

Swanson, Carl, P.., Pope, Clifford, H.. "The giant snakes the natural history of the boa contrictor,the anaconda, ì and the largest python". New York: New York: Alfred A. Knopf; 1967, 1967. Text.