Columbia subject headings:
English language--Study and teaching--Foreign speakers.
English language--Textbooks for foreign speakers--Evaluation.
Harvard subject headings:
English language--Textbooks for foreign speakers--German--Evaluation.
Great Britain--Social life and customs.
United States--Social life and customs.
Princeton subject headings:
English language--Textbooks for foreign speakers--German--Evaluation.
Great Britain--Social life and customs.
United States--Social life and customs.