APA (7th ed.) Citation

Christie, A. (1953). The Labour of Heracles. Penguin.

Chicago Style (17th ed.) Citation

Christie, Agatha. The Labour of Heracles. London: Penguin, 1953.

MLA (9th ed.) Citation

Christie, Agatha. The Labour of Heracles. Penguin, 1953.

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