APA (7th ed.) Citation

Butler, E. P., & Crawford, W. (1906). Pigs is pigs. McClure, Phillips & Co..

Chicago Style (17th ed.) Citation

Butler, Ellis Parker, and Will Crawford. Pigs Is Pigs. New York: McClure, Phillips & Co., 1906.

MLA (9th ed.) Citation

Butler, Ellis Parker, and Will Crawford. Pigs Is Pigs. McClure, Phillips & Co., 1906.