APA (7th ed.) Citation

Ullman, L. (2008). Ruby: Visual Quickstart Guide (1st edition.). Peachpit Press.

Chicago Style (17th ed.) Citation

Ullman, Larry. Ruby: Visual Quickstart Guide. 1st edition. Peachpit Press, 2008.

MLA (9th ed.) Citation

Ullman, Larry. Ruby: Visual Quickstart Guide. 1st edition. Peachpit Press, 2008.

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