Columbia subject headings:
Harvard subject headings:
German language--Computer-assisted instruction for foreign speakers.
German language--Foreign elements--English
German language--Programmed instruction.
German language--Study and teaching--Foreign speakers.
German language--Study and teaching--Philosophy.
Princeton subject headings:
German language--Computer-assisted instruction for foreign speakers.
German language--Foreign elements--English.
German language--Programmed instruction.
German language--Study and teaching--Foreign speakers.
German language--Study and teaching--Philosophy.