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Clark, K., Leonardo da Vinci, 1939, new edition with an introduction by M. Kemp, London, 1988

Costantino, M., Leonardo: Artist, Inventor and Scientist, New York/Avenel, New Jersey, 1993

Freud, S., Leonardo da Vinci: A Study in Psychosexuality, New York, 1947

Il Museo Leonardiano di Vinci, Cossiga, F., editor, Milan, 1986

Kemp, M., Leonardo da Vinci: The Marvellous Works of Nature and Man, London and Cambridge, 1981

Lansing, E.C., Leonardo, Master of the Renaissance, New York, 1942