APA (7th ed.) Citation

Christie, A. (1964). The mysterious Mr. Quin (New ed.). Dell.

Chicago Style (17th ed.) Citation

Christie, Agatha. The Mysterious Mr. Quin. New ed. New York: Dell, 1964.

MLA (9th ed.) Citation

Christie, Agatha. The Mysterious Mr. Quin. New ed. Dell, 1964.