APA (7th ed.) Citation

di Lampedusa, G., & Colquhoun, A. (1961). The leopard. A Signet Book.

Chicago Style (17th ed.) Citation

di Lampedusa, Giuseppe, and Archibald Colquhoun. The Leopard. New York: A Signet Book, 1961.

MLA (9th ed.) Citation

di Lampedusa, Giuseppe, and Archibald Colquhoun. The Leopard. A Signet Book, 1961.

Warning: These citations may not always be 100% accurate.