Reference and information services :  an introduction / 
general editors, Richard E. Bopp, Linda C. Smith. 
 - 3rd  ed. 
 - Englewood, CO :  Libraries Unlimited,  2001. 
 - xxiv, 617  p ;   cm. 
<br/><br/><label>ISBN: </label>1563086247 :  KES 4850 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Information services.<br/>Reference services (Libraries)