Crystal, David <br/><br/>
Advanced computer systems / 
David Crystal; Derek Davy. 
 - London :  Longman,  1977. 
 - 132 p. ;  21 cm. 
<br/><br/><label>ISBN: </label>0-582-56831-5 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Languages of the world