APA (7th ed.) Citation

Twigger, R. (1999). Big snake: The hunt for the world's longest python (1st U.S. ed.). W. Morrow.

Chicago Style (17th ed.) Citation

Twigger, Robert. Big Snake: The Hunt for the World's Longest Python. 1st U.S. ed. [New York]: W. Morrow, 1999.

MLA (9th ed.) Citation

Twigger, Robert. Big Snake: The Hunt for the World's Longest Python. 1st U.S. ed. W. Morrow, 1999.