APA (7th ed.) Citation

Clark, M. H. (1989). While my pretty one sleeps: A novel. Simon and Achuster.

Chicago Style (17th ed.) Citation

Clark, Mary Higgins. While My Pretty One Sleeps: A Novel. New York: Simon and Achuster, 1989.

MLA (9th ed.) Citation

Clark, Mary Higgins. While My Pretty One Sleeps: A Novel. Simon and Achuster, 1989.

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