APA (7th ed.) Citation

Vidal, G., Armstrong, G., & Gill, T. (1985). Vidal in Venice. Summit Books, in association with Antelope.

Chicago Style (17th ed.) Citation

Vidal, Gore, George Armstrong, and Tore Gill. Vidal in Venice. New York: Summit Books, in association with Antelope, 1985.

MLA (9th ed.) Citation

Vidal, Gore, et al. Vidal in Venice. Summit Books, in association with Antelope, 1985.