Thomson, A.J.. <br/><br/>
A Practical English Grammar /  

 - Fourth Ed. /  
 - New Delhi-1 :   Oxford University Press ,   1990 
 - p.383 :  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Linguistics
<br/><br/><label>Dewey Class. No.: </label>P111:2  / M6