APA (7th ed.) Citation

Christie,Agatha. (1968). By the pricking of my thumbs. HarperCollins Publishers.

Chicago Style (17th ed.) Citation

Christie,Agatha. By the Pricking of My Thumbs. London: HarperCollins Publishers, 1968.

MLA (9th ed.) Citation

Christie,Agatha. By the Pricking of My Thumbs. HarperCollins Publishers, 1968.

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