APA

Christie A., . (1984). N or M?. New York: Berkley Books.

Chicago

Christie Agatha, . 1984. N or M?. New York: Berkley Books.

Harvard

Christie A., . (1984). N or M?. New York: Berkley Books.

MLA

Christie Agatha, . N or M?. New York: Berkley Books. 1984.