This gave straight information about Newton’s 3rd Law directly from NASA, as well providing different examples about how, and when it occurs.

This gave more background information about Newton and an overview about his 3 laws as well as providing different examples.

This gave information and the background story of Sir Isaac Newton himself from Eric Weisstein’s World of Science.

This site gave in-depth information about Newton’s 3rd Law from the University of Tennessee Physics Department, as well as providing diagrams and visual aid.