1. Auden, W.H. 1948. The Guilty Vicarage, Notes on the Detective Story, By an Addict. Harper’s Magazine. Accessed October 23, 2019. https://harpers.org/archive/1948/05/the-guilty-vicarage/2/.
2. Bargainnier, Earl F. 1980. The Gentle Art of Murder: The Detective Fiction of Agatha Christie. Bowling Green, OH: Bowling Green University Popular Press.
3. Barnard, Robert. 1980. A Talent to Deceive: An Appreciation of Agatha Christie. New York: Dodd, Mead and Co.
4. Blake Price, Cheryl. 2019. Chemical Crimes: Science and Poison in Victorian Crime Fiction. Columbus, OH: Ohio State University Press.
5. Campbell, SueEllen. 1983. The Detective Heroine and the Death of Her Hero: Dorothy Sayers to P. D. James. Modern Fiction Studies 29 (3): 497–510. JSTOR. http://www.jstor.org/stable/26281374.