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Day, Felicity. “The Mystery of Agatha Christie: The Real-Life Story of the Crime Novelist.” Https://Www.discoverbritain.com, Discover Britain, 10 Dec. 2020, www.discoverbritain.com/history/icons/agatha-christie-mystery/.
(The Editors of Encyclopedia Britannica)
Shelly Schwartz. “How Agatha Christie Wrote 82 Detective Novels in 55 Years.” ThoughtCo, 30 July 2021, www.thoughtco.com/agatha-christie-1779787.