Computer-based library and information systems 
/ by J. P. Henley  
 - 2d ed. 
 - London  MacDonald  1972  
 - 106 p. : ill. ; 23 cm. 
<br/><br/>p. 96-101.  
<br/><br/><label>ISBN: </label>044419584X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Information technology<br/>Libraries--Automation
<br/><br/><label>LC Class. No.: </label>Z699