APA (7th ed.) Citation

Blake, N. (1935). A question of proof. Harper & Bros..

Chicago Style (17th ed.) Citation

Blake, Nicholas. A Question of Proof. New York, London: Harper & Bros., 1935.

MLA (8th ed.) Citation

Blake, Nicholas. A Question of Proof. Harper & Bros., 1935.

Warning: These citations may not always be 100% accurate.