Cita APA (7th ed.)

Gilbert, J., & Lockley, N. (1999). Leonardo. D. Kindersley.

Cita Chicago (17th ed.)

Gilbert, John, i Neil Lockley. Leonardo. London: D. Kindersley, 1999.

Cita MLA (9th ed.)

Gilbert, John, i Neil Lockley. Leonardo. D. Kindersley, 1999.