Cita APA (7a ed.)

Douglas, R. L. (1944). Leonardo da Vinci, his life and his picture . University of Chicago press.

Cita Chicago Style (17a ed.)

Douglas, Robert Langton. Leonardo Da Vinci, His Life and His Picture . Chicago: University of Chicago press, 1944.

Cita MLA (9a ed.)

Douglas, Robert Langton. Leonardo Da Vinci, His Life and His Picture . University of Chicago press, 1944.