Berkoff, N. A. <br/><br/>
English structure and exercise :  for university students studying English as a foreign language / 
N.A. Berkoff 
 - London :  Allman & Son Ltd,  1963 
 - 159 p. ;  18 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language--Study and teaching--Foreign speakers