APA (7th ed.) Citation

Leonardo, d. V., & Steadman, R. (1983). I, Leonardo (1st American ed.). Summit Books.

Chicago Style (17th ed.) Citation

Leonardo, da Vinci, and Ralph Steadman. I, Leonardo. 1st American ed. New York: Summit Books, 1983.

MLA (9th ed.) Citation

Leonardo, da Vinci, and Ralph Steadman. I, Leonardo. 1st American ed. Summit Books, 1983.