APA (7th ed.) Citation

Christie, A. (1948). The murder at the vicarage. Penguin Books.

Chicago Style (17th ed.) Citation

Christie, Agatha. The Murder at the Vicarage. Harmondsworth: Penguin Books, 1948.

MLA (9th ed.) Citation

Christie, Agatha. The Murder at the Vicarage. Penguin Books, 1948.