Bargainner, Earl F. The Gentle Art of Murder: The Detective Fiction of Agatha Christie. Bowling Green: Bowling Green State University Popular Press, 1980.
Barnard, Robert. A Talent to Deceive: An Appreciation of Agatha Christie. New York: Dodd, Mead & Company, 1980.
Fitzgibbon, Russel H. The Agatha Christie Companion. Bowling Green: Bowling Green State University Popular Press, 1980.
Haining, Peter. Agatha Christie: Murder in Four Acts. Great Britain: Virgin Books, 1990.
Keating, H.R.F. Agatha Christie: First Lady of Crime. New York: Holt, Rinehart and Winston, 1977.
Osborne, Charles. The Life and Crimes of Agatha Christie. London: HarperCollins, 1982.
Wagoner, Mary S. Agatha Christie. Boston: G.K. Hall & Co., 1986.