APA (7th ed.) Citation

Aitken, I., Coulter, I., & Kaufman, G. (1966). The Left: A symposium. London: Anthony Blond.

Chicago Style (17th ed.) Citation

Aitken, Ian, Ian Coulter, and Gerald Kaufman. The Left: A Symposium. London: Anthony Blond, 1966.

MLA (8th ed.) Citation

Aitken, Ian, et al. The Left: A Symposium. London: Anthony Blond, 1966.