Columbia subject headings:
Harvard subject headings:
Business writing--Problems, exercises, etc.
Communication
Communication--Problems, exercises, etc.
English language--Business English
English language--Technical English
English language--Textbooks for foreign speakers
Professions--United States
Professions--United States--Problems, exercises, etc.
Princeton subject headings:
Communication.
English language--Business English.
English language--Technical English.
English language--Textbooks for foreign speakers.
Professions--United States.