Columbia subject headings:
Harvard subject headings:
Christie, Agatha, 1890-1976--Criticism and interpretation.
Christie, Agatha, 1890-1976--Psychology.
Princeton subject headings:
Christie, Agatha, 1890-1976--Criticism and interpretation.
Christie, Agatha, 1890-1976--Knowledge--Psychology.
Detective and mystery stories, English--History and criticism.
Psychoanalysis and literature.
Psychology in literature.