Columbia subject headings:
Harvard subject headings:
Böll, Heinrich, 1917-1985--Political and social views.
Maḥfūẓ, Najīb, 1911-2006--Political and social views.
Social problems in literature.
Princeton subject headings:
Böll, Heinrich, 1917-1985--Political and social views.
Maḥfūẓ, Najīb, 1911-2006--Political and social views.
Social problems in literature.