Douglas, R. L. (1944). Leonardo da Vinci: His life and his pictures. The University of Chicago Press.
Citace podle Chicago (17th ed.)Douglas, R. Langton. Leonardo Da Vinci: His Life and His Pictures. Chicago: The University of Chicago Press, 1944.
Citace podle MLA (9th ed.)Douglas, R. Langton. Leonardo Da Vinci: His Life and His Pictures. The University of Chicago Press, 1944.
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