Columbia subject headings:
Bannā, Aḥmad, 1882?-1958--Correspondence.
Bannā, Ḥasan, 1906-1949--Correspondence.
Muslims--Egypt--Correspondence.
Harvard subject headings:
Bannā, Ḥasan, 1906-1949--Correspondence.
Bannā, Aḥmad, 1882?-1958--Correspondence.
Muslims--Egypt--Correspondence.
Princeton subject headings:
Bannā, Aḥmad, 1882?-1958--Correspondence.
Bannā, Ḥasan, 1906-1949--Correspondence.
Muslims--Egypt--Correspondence.