Christie, A. <. (1986). Passenger to Frankfurt = Passagier nach Frankfurt <engl.>: Agatha Christie. Fontana/Collins.
Cita Chicago (17th ed.)Christie, Agatha <1890-1976>. Passenger to Frankfurt = Passagier Nach Frankfurt <engl.>: Agatha Christie. Fontana/Collins, 1986.
Cita MLA (8th ed.)Christie, Agatha <1890-1976>. Passenger to Frankfurt = Passagier Nach Frankfurt <engl.>: Agatha Christie. Fontana/Collins, 1986.
Atenció: Aquestes cites poden no estar 100% correctes.