APA (7th ed.) Citation

Becker, J., & Vennewitz, L. (1979). Sleepless days. Secker & Warburg.

Chicago Style (17th ed.) Citation

Becker, Jurek, and Leila Vennewitz. Sleepless Days. London: Secker & Warburg, 1979.

MLA (8th ed.) Citation

Becker, Jurek, and Leila Vennewitz. Sleepless Days. Secker & Warburg, 1979.