APA (7th ed.) Citation

Thompson, D. I. (1939). Knave and three hearts. Mills & Boon.

Chicago Style (17th ed.) Citation

Thompson, Doris Irene. Knave and Three Hearts. London: Mills & Boon, 1939.

MLA (8th ed.) Citation

Thompson, Doris Irene. Knave and Three Hearts. Mills & Boon, 1939.