APA (7th ed.) Citation

Douglas-Smith, A. E. (1942). Guilty Germans? Gollancz.

Chicago Style (17th ed.) Citation

Douglas-Smith, Aubrey Edward. Guilty Germans? London: Gollancz, 1942.

MLA (8th ed.) Citation

Douglas-Smith, Aubrey Edward. Guilty Germans? Gollancz, 1942.