Columbia subject headings:
Harvard subject headings:
Caliphate--Congresses.
Caliphs--Biography.
Caliphs--Congresses.
Islamic Empire--History--Congresses.
Islamic Empire--Kings and rulers--Congresses.
ʻUthmān ibn ʻAffān, Caliph, -656--Congresses.
Princeton subject headings:
Caliphate--Congresses.
Caliphs--Biography.
Caliphs--Congresses.
Islamic Empire--History--Congresses.
Islamic Empire--Kings and rulers--Congresses.
ʻUthmān ibn ʻAffān, Caliph, -656--Congresses.