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Costantino, Maria. Leonardo: Artist, Inventor and Scientist. Crescent Books: New York, 1993.
Freud, Sigmund. Leonardo da Vinci and a Memory of his Childhood. A. Tyson, trans. W.W. Norton & Co.: New York, 1964.
Masters, Roger D. Fortune is a River: Leonardo da Vinci and Niccolo Machiavelli's Magnificent Dream to Change the Course of Florentine History. The Free Press: New York, 1998.
Pater, Walter. The Renaissance: Studies in Art and Poetry. A. Phillips, ed. Oxford University Press: London, 1998.
Turner, A. Richard. Inventing Leonardo. Knopf: New York, 1993.
Vasari, Giorgio. Lives of the Artists, Volume 1. George Bull, trans. Penguin: New York, 1965.
Wasserman, Jack. Leonardo. Harry N. Abrams, Inc.: New York, 1984.
Wilde, Oscar. The Critic as Artist. Sun and Moon Press: Los Angeles, 1997.
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