APA (7th ed.) Citation

Christie, A. (2000). Murder at the vicarage. A Signet Book.

Chicago Style (17th ed.) Citation

Christie, Agatha. Murder at the Vicarage. New York: A Signet Book, 2000.

MLA (8th ed.) Citation

Christie, Agatha. Murder at the Vicarage. A Signet Book, 2000.