Russ Olsen.
Design Patterns in Ruby.
Addison-Wesley, 2007.
ISBN: 0321490452

Available on-line through the University's Safari subscription.

Ernest Cline.
Ready Player One.
Broadway Books, 2011.
ISBN: 9780307887443

Available as a commercial e-book at Google Play Store.

Grady Booch, et al.
Object-Oriented Analysis and Design with Applications, 3rd Edition.
Addison-Wesley, 2007.
ISBN: 9780201895513

Jay Fields, Shane Harvie, Martin Fowler, & Kent Beck.
Refactoring: Ruby Edition.
Addison-Wesley, 2009.
ISBN: 0321603508

Available on-line through the University's Safari subscription.

Elisabeth Freeman, Eric Freeman, Bert Bates, & Kathy Sierra.
Head First Design Patterns.
O'Reilly, 2004.
ISBN: 0596007124

Available on-line through the University's Safari subscription.

Pete Goodliffe.
Code Craft: The Practice of Writing Excellent Code.
No Starch Press, 2006.
ISBN: 9781593271190

Available on-line through the University's Safari subscription.

Alan Harris & Konstantin Haase.
Sinatra: Up and Running.
O'Reilly, 2011.
ISBN: 1449304230

Available on-line through the University's Safari subscription.