Columbia subject headings:
Education--Sudan--History.
English language--Political aspects--Sudan--History.
English language--Study and teaching--Sudan--History.
English language--Sudan--History.
Sudan--Languages.
Harvard subject headings:
Education--Sudan--History.
English language--Political aspects--Sudan--History.
English language--Study and teaching--Sudan--History.
English language--Sudan--History.
Sudan--Languages.
Princeton subject headings:
English language--Study and teaching--Sudan.