APA (7th ed.) Citation

International Society for the Arts, S. (1968). Leonardo. Pergamon Press.

Chicago Style (17th ed.) Citation

International Society for the Arts, Sciences. Leonardo. Oxford, England ; New York, U.S.A.: Pergamon Press, 1968.

MLA (8th ed.) Citation

International Society for the Arts, Sciences. Leonardo. Pergamon Press, 1968.