Allen, W. Stannard.
Living English structure: a practice book for foreign students /
W. Stannard Allen 
. - 4th edition 
. - London : Longmans,  1965 
. - x, 349 p.  schem.  19 cm.  1 дод. (29 с.) 
<br/><br/> Назва додатку : Keys to the exercises.