Columbia subject headings:
Harvard subject headings:
Ayala, Francisco, 1906---Political and social views.
Ayala, Francisco, 1906---Symbolism.
Ayala, Francisco, 1906-2009--Political and social views.
Ayala, Francisco, 1906-2009--Symbolism.
Princeton subject headings:
Ayala, Francisco, 1906-2009--Criticism and interpretation.