APA (7th ed.) Citation

Tabouis, G. R. (1938). Blackmail or war. Penguin Books.

Chicago Style (17th ed.) Citation

Tabouis, Geneviève R. Blackmail or War. Harmondsworth: Penguin Books, 1938.

MLA (9th ed.) Citation

Tabouis, Geneviève R. Blackmail or War. Penguin Books, 1938.