APA (7th ed.) Citation

Ingpen, R. R., & Wilkinson, P. (1991). Encyclopedia of events that changed the world: Eighty turning points in history. Viking Studio Books.

Chicago Style (17th ed.) Citation

Ingpen, Robert R., and Philip Wilkinson. Encyclopedia of Events That Changed the World: Eighty Turning Points in History. New York, N.Y: Viking Studio Books, 1991.

MLA (9th ed.) Citation

Ingpen, Robert R., and Philip Wilkinson. Encyclopedia of Events That Changed the World: Eighty Turning Points in History. Viking Studio Books, 1991.