Thomson, A J; Martinet, A V <br/><br/>
Practical English grammar exercise 2 

 -  Oxford University Press, New Delhi  1981 
 - 205 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English structural system
<br/><br/><label>Dewey Class. No.: </label>PG 425  THO-P2.2