APA (7th ed.) Citation

Thomas, G., & Morgan-Witts, M. (1969). The day their world ended. Souvenir.

Chicago Style (17th ed.) Citation

Thomas, Gordon, and Max Morgan-Witts. The Day Their World Ended. London: Souvenir, 1969.

MLA (9th ed.) Citation

Thomas, Gordon, and Max Morgan-Witts. The Day Their World Ended. Souvenir, 1969.