APA (7th ed.) Citation

Christiansen, T., & Torkington, N. (2003). Perl cookbook (2nd ed.). O'Reilly.

Chicago Style (17th ed.) Citation

Christiansen, Tom, and Nathan Torkington. Perl Cookbook. 2nd ed. Sebastopol, CA: O'Reilly, 2003.

MLA (8th ed.) Citation

Christiansen, Tom, and Nathan Torkington. Perl Cookbook. 2nd ed. O'Reilly, 2003.