Study object oriented stuff once again, please suggest book names

Years ago, I learned object oriented design and analysis in Chinese books. Recently I was thinking about brushing up my knowledge once again, therefore I decided to read famous English books about object oriented design and analysis. Right now I'm reading <<Refactoring - Improving the Design of Existing Code>> written by Martin Fowler.

Folks - Please recommend book names if you have good ideas.

Thank you very much!