Optimus Prime - Wikipedia - Biography, appearances in films, comics, and books, with details of toys, and other merchandise. - http://en.wikipedia.org/wiki/Optimus_Prime
Hasbro Can't Toy With Optimus Prime - By Lane Crockett. [The Shreveport Times - Archived at Electric Escape]. Article explains why Optimus kept returning to the series after his "death" and why toys of him continue to be released. - http://www.electric-escape.net/node/587