APA (7th ed.) Citation

Christie, A. (2001). By the pricking of my thumbs. HarperCollins Publishers.

Chicago Style (17th ed.) Citation

Christie, Agatha. By the Pricking of My Thumbs. London: HarperCollins Publishers, 2001.

MLA (9th ed.) Citation

Christie, Agatha. By the Pricking of My Thumbs. HarperCollins Publishers, 2001.

Warning: These citations may not always be 100% accurate.