Cita APA (7th ed.)

Douglas, R. L. (1944). Leonardo da Vinci: His life and his pictures. The University of Chicago Press.

Cita Chicago (17th ed.)

Douglas, R. Langton. Leonardo Da Vinci: His Life and His Pictures. Chicago: The University of Chicago Press, 1944.

Cita MLA (9th ed.)

Douglas, R. Langton. Leonardo Da Vinci: His Life and His Pictures. The University of Chicago Press, 1944.