[chrisgoman]

These are the timeless books and should be required reading

Pragmatic Programmer: http://amzn.com/020161622X

Code Complete 2: http://amzn.com/0735619670

[rcavezza]

Refactoring by Martin Fowler is a great one https://www.amazon.com/Refactoring-Improving-Existing-Addiso...

Design Patterns is also very well known https://www.amazon.com/Design-Patterns-Elements-Reusable-Obj...