CASSELL, K.A.  AND UMMA H. <br/><br/>
Reference and information services in the 21st century:an introduction 

 - Neal-Schuman pub  New York   2011 
<br/><br/><label>ISBN: </label>9781555707408 
<br/><br/><label>LC Class. No.: </label>Z 711   / C37 2011