APA (7th ed.) Citation

Queen, E. (1939). The four of hearts: A problem in deduction. V. Gollancz.

Chicago Style (17th ed.) Citation

Queen, Ellery. The Four of Hearts: A Problem in Deduction. London: V. Gollancz, 1939.

MLA (8th ed.) Citation

Queen, Ellery. The Four of Hearts: A Problem in Deduction. V. Gollancz, 1939.