- "Dynamic Object-Oriented Design in Ruby: Building Flexible and Reusable Object-Oriented Applications" (2012)
- "Object-Oriented Programming for the Absolute Beginner" (2012)
- "Essential Ruby" (2011)
- "Practical Ruby: A Comprehensive Guide for Serious Programmers" (2011)
- "Ruby on Rails: An Illustrated Guide" (2010)
- "The Way of the Web Tester: A Beginner's Guide to Automating Tests with Selenium WebDriver and Ruby" (2010)
- "Code to Learn by: A Guide for Learning How to Code" (2009)
- "Pragmatic Unit Testing in Java with JUnit" (2003)
- "Test-Driven Development in Microsoft .NET" (2003)
Articles
- "The Art of Unit Testing" (2002)
- "Test-Driven Development: A Practical Guide" (2002)
- "Unit Testing in Java: A Beginner's Guide" (2002)
- "Test-Driven Development: A Case Study" (2001)
- "Automated Testing with JUnit" (2001)