Christie, A. (1984). The big four (1st edition.). Berkley Books.
Cita Chicago Style (17a ed.)Christie, Agatha. The Big Four. 1st edition. New York: Berkley Books, 1984.
Cita MLA (9a ed.)Christie, Agatha. The Big Four. 1st edition. Berkley Books, 1984.
Precaución: Estas citas no son 100% exactas.