APA (7th ed.) Citation

Christie, A. (1939). Hercule Poirot's christmas. Collins.

Chicago Style (17th ed.) Citation

Christie, Agatha. Hercule Poirot's Christmas. London: Collins, 1939.

MLA (9th ed.) Citation

Christie, Agatha. Hercule Poirot's Christmas. Collins, 1939.

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