APA (7th ed.) Citation

Vittorini, E., David, W., & Hemingway, E. (1949). In Sicily. New Directions.

Chicago Style (17th ed.) Citation

Vittorini, Elio, Wilfrid David, and Ernest Hemingway. In Sicily. New York: New Directions, 1949.

MLA (9th ed.) Citation

Vittorini, Elio, et al. In Sicily. New Directions, 1949.