The Gregg reference manual  English 
by William Sabin A 
 - New York  Harcourt, Brace Jovanovich  1956 
 - 154 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language--Business English<br/>English language--Grammar<br/>English language--Transcription<br/>Commercial correspondence
<br/><br/><label>Dewey Class. No.: </label>808.042 W6703 G  / 9862