APA (7th ed.) Citation

Christie, A. (1931). The sittaford mystery. Harper.

Chicago Style (17th ed.) Citation

Christie, Agatha. The Sittaford Mystery. London: Harper, 1931.

MLA (9th ed.) Citation

Christie, Agatha. The Sittaford Mystery. Harper, 1931.

Warning: These citations may not always be 100% accurate.