Gaya APA

Ingpen, R., Wilkinson, P. (1993). Encyclopedia of Ideas That Changed the World: The Greatest Discoveries and Inventions of Human History (First Published). Great Britain: Dragon\'s World Ltd.

Gaya MLA

Ingpen, Robert., Wilkinson, Philip. "Encyclopedia of Ideas That Changed the World: The Greatest Discoveries and Inventions of Human History". First Published Great Britain: Dragon\'s World Ltd, 1993. Referensi.