APA (7th ed.) Citation

Christie, A. (2004). Poirot: Four classic cases. HarperCollins Publishers.

Chicago Style (17th ed.) Citation

Christie, Agatha. Poirot: Four Classic Cases. London: HarperCollins Publishers, 2004.

MLA (9th ed.) Citation

Christie, Agatha. Poirot: Four Classic Cases. HarperCollins Publishers, 2004.

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