==================================================================================================== Design Patterns resources
- O'Reilly. Eric Freeman, Elisabeth Robson. ISBN-13: 978-0596007126 / ISBN-10: 9780596007126 Head First Design Patterns: A Brain-Friendly Guide. 1st Edition.
- O'Reilly. Eric Freeman, Elisabeth Robson. ISBN-13: 978-1492078005 / ISBN-10: 149207800X Head First Design Patterns: Building Extensible and Maintainable Object-Oriented Software. 2nd Edition