Columbia subject headings:
English language--Business English--Study and teaching.
English language--Study and teaching--Foreign speakers.
English language--Technical English--Study and teaching.
Vocational education.
Harvard subject headings:
Second language acquisition.
Vocational education.
Princeton subject headings:
English language--Business English--Study and teaching.
English language--Study and teaching--Foreign speakers.
English language--Technical English--Study and teaching.
Vocational education.