Columbia subject headings:
Christie, Agatha, 1890-1976. Murder of Roger Ackroyd.
Harvard subject headings:
Christie, Agatha, 1890-1976. Murder of Roger Ackroyd.
Detective and mystery stories, English--History and criticism.
Detective and mystery stories--Authorship
Poirot, Hercule (Fictitious character)
Psychoanalysis and literature--England--History--20th century.
Princeton subject headings:
Christie, Agatha, 1890-1976. Murder of Roger Ackroyd.
Psychoanalysis and literature--England--History--20th century.