Sources:

Cennini, Cennino D'Andrea. The Craftsman's Handbook. Dover Publications, Inc., New
York. 1933.

Farago, Claire J. "Leonardo's Battle of Anghiari" A Study in the exchange between
theory and practice". Ed. Farago, Claire J. Leonardo da Vinci: Selected Scholarship. Garland Publishing, Inc. New York, 1999.

Harris, Sheila. Personal correspondence as museum docent with Kevin Shen. Getty
Museum, Los Angeles.

Kemp, Martin, Ed. Leonardo On Painting. Yale University Press, New Haven. 1989

Newton, Travers H., and Spencer, John R., "On the Location of Leonardo's Battle of
Anghiari". Ed. Farago, Claire J. Leonardo da Vinci: Selected Scholarship. Garland Publishing, Inc. New York, 1999.

Vallentin, Antonina. Leonardo da Vinci: The Tragic Pursuit of Perfection. The Viking
Press, New York. 1938.

Wallace, Robert, et. Al. The World of Leonardo: 1452-1519. Time Incorporated, New
York, 1966.