Bald, W.D. Cobb, D. J Schwarz, A <br/><br/>
Active grammar 

 - London  Longman  1986 
 - viii, 152 p.  24 cm.  PB 
<br/><br/><label>ISBN: </label>0582517389 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Structural systems of standard English
<br/><br/><label>Dewey Class. No.: </label>425  / BAL