APA (7th ed.) Citation

Buchan, J. (1951). The gap in the curtain. Hodder and Stoughton.

Chicago Style (17th ed.) Citation

Buchan, John. The Gap in the Curtain. London: Hodder and Stoughton, 1951.

MLA (9th ed.) Citation

Buchan, John. The Gap in the Curtain. Hodder and Stoughton, 1951.