Where can I find source code and/or project samples showing how to use design pattern(s) and OOD principles?

Where can I find source code and/or project samples using the correct design pattern(s) given the circumstances of the use case applying the correct OOD principles?

Design Patterns Object Oriented Design: Software needs to be robust and extensible with the use if inheritance and aggregation. - singleton - MVC (Model View Controller) - Delegate - factory - adapter - bridge - visitor - command - proxy - observer

Applying the correct principles; for example for Software Development using Object-Oriented Programming principles (OOD/OOA): Inheritance, Encapsulation, Abstraction, Polymorphism, Cohesion and Coupling.