APA (7th ed.) Citation

Christie, A. (1972). Passenger to Frankfurt: An extravaganza. Pocket Books.

Chicago Style (17th ed.) Citation

Christie, Agatha. Passenger to Frankfurt: An Extravaganza. New York: Pocket Books, 1972.

MLA (8th ed.) Citation

Christie, Agatha. Passenger to Frankfurt: An Extravaganza. Pocket Books, 1972.