Crystal, David,  1941- <br/><br/>
Advanced conversational English / 
by David Crystal, Derek Davy 
 - London :  Longman,  1975 
 - x, 132 p. ;  22 cm. 
<br/><br/> Includes index 
<br/><br/>Bibliography : p. 129 
<br/><br/><label>ISBN: </label>0582550742 
<br/><br/><label>LCCN: </label>76-359485 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language--Study and teaching--Foreign speakers<br/>English language--Conversation and phrase books<br/>English language--Spoken English