APA (7th ed.) Citation

Christie, A. (1968). By the pricking of my thumbs. Collins.

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

Christie, Agatha. By the Pricking of My Thumbs. Collins, 1968.

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