APA (7th ed.) Citation

Belloc, H., & Chesterton, G. K. (1940). But soft: We are observed! Penguin Books.

Chicago Style (17th ed.) Citation

Belloc, Hilaire, and G. K. Chesterton. But Soft: We Are Observed! Harmondsworth, England: Penguin Books, 1940.

MLA (8th ed.) Citation

Belloc, Hilaire, and G. K. Chesterton. But Soft: We Are Observed! Penguin Books, 1940.