Columbia subject headings:
Pérez de Ayala, Ramón, 1880-1962--Criticism and interpretation.
Harvard subject headings:
Hope in literature.
Pérez de Ayala, Ramón, 1880-1962--Criticism and interpretation.
Reality in literature.
Princeton subject headings:
Pérez de Ayala, Ramón, 1880-1962--Criticism and interpretation.