This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Did looking them up not help at *all*?! Is this an interview question? If so, I'm baffled for multiple reasons: if you're interviewing for a position for which you'd be asked this, I'd be concerned if you didn't know. If you didn't know, I'd be concerned you couldn't just look it up.