Dyfyniad APA

Ingpen, R., & Wilkinson, P. (1993). Encyclopedia of Ideas that Changed the World: The Greatest Discoveries and Inventions of Human History. Dragons World.

Dyfyniad Arddull Chicago

Ingpen, Robert, and Philip Wilkinson. Encyclopedia of Ideas That Changed the World: The Greatest Discoveries and Inventions of Human History. Limpsfield: Dragons World, 1993.

Dyfyniad MLA

Ingpen, Robert, and Philip Wilkinson. Encyclopedia of Ideas That Changed the World: The Greatest Discoveries and Inventions of Human History. Dragons World, 1993.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.