Christie, A. (2016). At bertram's hotel. Harper Collins, London.
Cita Chicago (17th ed.)Christie, Agatha. At Bertram's Hotel. Harper Collins, London, 2016.
Cita MLA (9th ed.)Christie, Agatha. At Bertram's Hotel. Harper Collins, London, 2016.
Atenció: Aquestes cites poden no estar 100% correctes.