APA (7th ed.) Citation

Ingpen & Wilkinson. (1993). Encyclopedia of ideas that changed the World: The greatest discoveries and inventions of human history. Dragon's World.

Chicago Style (17th ed.) Citation

Ingpen and Wilkinson. Encyclopedia of Ideas That Changed the World: The Greatest Discoveries and Inventions of Human History. Limpsfield, England: Dragon's World, 1993.

MLA (9th ed.) Citation

Ingpen and Wilkinson. Encyclopedia of Ideas That Changed the World: The Greatest Discoveries and Inventions of Human History. Dragon's World, 1993.