APA (7th ed.) Citation

Gardner, E. S., & Christie, A. (1968). The case of the careless cupid. Published for the Detective Book Club by W. J. Black.

Chicago Style (17th ed.) Citation

Gardner, Erle Stanley, and Agatha Christie. The Case of the Careless Cupid. Roslyn, N.Y.: Published for the Detective Book Club by W. J. Black, 1968.

MLA (9th ed.) Citation

Gardner, Erle Stanley, and Agatha Christie. The Case of the Careless Cupid. Published for the Detective Book Club by W. J. Black, 1968.