Yorkey, Richard. C <br/><br/>
English for International Communication / 
Richard C. Yorkey 
 -  Litton Educational Publishing, Inc.,  c1977. 
 - viii, 200 p. :  ill. ;  16 cm. 
<br/><br/> Includes Index. 
<br/><br/><label>ISBN: </label>0278499317 (pbk.) 0278499252 
<br/><br/><label>LC Class. No.: </label>PE1128  / .Y677 1978