APA (7th ed.) Citation

Christiansen, T., & Torkington, N. (1998). Perl cookbook / Tom Christiansen and Nathan Torkington. O'Reilly.

Chicago Style (17th ed.) Citation

Christiansen, Tom, and Nathan Torkington. Perl Cookbook / Tom Christiansen and Nathan Torkington. Cambridge: O'Reilly, 1998.

MLA (9th ed.) Citation

Christiansen, Tom, and Nathan Torkington. Perl Cookbook / Tom Christiansen and Nathan Torkington. O'Reilly, 1998.

Warning: These citations may not always be 100% accurate.