Ingpen, R. R., & Wilkinson, P. (1991). Encyclopedia of events that changed the world: Eighty turning points in history. Viking Studio Books.
Citace podle Chicago (17th ed.)Ingpen, Robert R., a Philip Wilkinson. Encyclopedia of Events That Changed the World: Eighty Turning Points in History. New York, N.Y: Viking Studio Books, 1991.
Citace podle MLA (9th ed.)Ingpen, Robert R., a Philip Wilkinson. Encyclopedia of Events That Changed the World: Eighty Turning Points in History. Viking Studio Books, 1991.
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