APA Style

CHRISTIE, A. (2012). The Mysterious Affair at Styles : The First Hercule Poirot Mystery . New York: William Morrow/HarperCollins.

MLA Style

CHRISTIE, Agatha. "The Mysterious Affair at Styles : The First Hercule Poirot Mystery". New York: William Morrow/HarperCollins, 2012. Text.