APA (7th ed.) Citation

Christie, A. (1941). The Mysterious affair at Styles. Penguin.

Chicago Style (17th ed.) Citation

Christie, Agatha. The Mysterious Affair at Styles. London: Penguin, 1941.

MLA (9th ed.) Citation

Christie, Agatha. The Mysterious Affair at Styles. Penguin, 1941.

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