Cita APA (7a ed.)

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.