APA (7th ed.) Citation

Carlson, L., & Richardson, L. (2006). Ruby cookbook. O'Reilly.

Chicago Style (17th ed.) Citation

Carlson, Lucas, and Leonard Richardson. Ruby Cookbook. Sebastopol [etc.]: O'Reilly, 2006.

MLA (9th ed.) Citation

Carlson, Lucas, and Leonard Richardson. Ruby Cookbook. O'Reilly, 2006.

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