Columbia subject headings:
Harvard subject headings:
English language--Study and teaching--Congresses
English language--Study and teaching--Europe, Central--Congresses.
English language--Study and teaching--Foreign speakers--Congresses
Princeton subject headings:
English language--Study and teaching--Congresses.
English language--Study and teaching--Europe, Central--Congresses.
English language--Study and teaching--Foreign speakers--Congresses.