APA (7th ed.) Citation

Simpson, G. G. (1951). Horses: The story of the horse family in the modern world and through sixty million years of history. Oxford University Press.

Chicago Style (17th ed.) Citation

Simpson, George Gaylord. Horses: The Story of the Horse Family in the Modern World and Through Sixty Million Years of History. New York: Oxford University Press, 1951.

MLA (9th ed.) Citation

Simpson, George Gaylord. Horses: The Story of the Horse Family in the Modern World and Through Sixty Million Years of History. Oxford University Press, 1951.