APA (7th ed.) Citation

Vittorini, E., Wilfrid, D., & Hemingway, E. (1961). Conservation in Sicily. Penguin books.

Chicago Style (17th ed.) Citation

Vittorini, Elio, David Wilfrid, and Ernest Hemingway. Conservation in Sicily. Middlesex: Penguin books, 1961.

MLA (8th ed.) Citation

Vittorini, Elio, et al. Conservation in Sicily. Penguin books, 1961.