APA (7th ed.) Citation

Schwartz, R. L., Phoenix, T., & Foy, B. D. (2005). Learning Perl (4th ed.). O'Reilly.

Chicago Style (17th ed.) Citation

Schwartz, Randal L., Tom Phoenix, and Brian D. Foy. Learning Perl. 4th ed. Sebastopol, CA: O'Reilly, 2005.

MLA (8th ed.) Citation

Schwartz, Randal L., et al. Learning Perl. 4th ed. O'Reilly, 2005.