Document retrieval:   Sources & services 

 - 3rd ed.  
 - San Francisco:   The information store, Inc.,   1985 
 - 241p.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Library science
<br/><br/><label>Subjects--Index Terms: </label>Documentation 
<br/><br/><label>Universal Decimal Class. No.: </label>D 061.66/.68(058.7)  / M5