APA Style

CHRISTIE, A. (2011). The Murder of Roger Ackroyd: a Hercule Poirot Mystery . New York: William Morrow/HarperCollins.

MLA Style

CHRISTIE, Agatha. "The Murder of Roger Ackroyd: a Hercule Poirot Mystery". New York: William Morrow/HarperCollins, 2011. Text.