Cassell, Kay Ann. <br/><br/>
Reference and information services in the 21st century   : an introduction / 
Kay Ann Cassell. 
 - Revised edition. 
 - London :  Facet Publishing,  2009. 
 - 461 p. 
<br/><br/> Paperback. 
<br/><br/><label>ISBN: </label>1856046885 9781856046886 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Library & information services.<br/>Library & Information Science.
<br/><br/><label>Dewey Class. No.: </label>020  / CAR