APA (7th ed.) Citation

Christie, A. (1940). Hercule Poirot's Christmas. Collins, for the Crime Club.

Chicago Style (17th ed.) Citation

Christie, Agatha. Hercule Poirot's Christmas. London ; Sydney: Collins, for the Crime Club, 1940.

MLA (8th ed.) Citation

Christie, Agatha. Hercule Poirot's Christmas. Collins, for the Crime Club, 1940.

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