APA (7th ed.) Citation

Christie, A. (1990). The mirror crack'd from side to side. Harper Paperbacks.

Chicago Style (17th ed.) Citation

Christie, Agatha. The Mirror Crack'd from Side to Side. New York: Harper Paperbacks, 1990.

MLA (9th ed.) Citation

Christie, Agatha. The Mirror Crack'd from Side to Side. Harper Paperbacks, 1990.