APA (7th ed.) Citation

Christie, A., & Pierre-Langers, C. (1932). L'Affaire Prothero. Librairie des Champs-Élysées.

Chicago Style (17th ed.) Citation

Christie, Agatha, and Claude Pierre-Langers. L'Affaire Prothero. Paris: Librairie des Champs-Élysées, 1932.

MLA (8th ed.) Citation

Christie, Agatha, and Claude Pierre-Langers. L'Affaire Prothero. Librairie des Champs-Élysées, 1932.

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