APA (7th ed.) Citation

Christie, A. (1968). The LABORS of Hercules. A Dell Book.

Chicago Style (17th ed.) Citation

Christie, Agatha. The LABORS of Hercules. New York: A Dell Book, 1968.

MLA (9th ed.) Citation

Christie, Agatha. The LABORS of Hercules. A Dell Book, 1968.