Cassell, Kay Ann. Hiremath, Uma. <br/><br/>
Reference Information Services 21st Century an Introduction. 

 - 1st Ed. 
 -  Facet Publishing,  2009. 
 - 461 P. 
<br/><br/><label>ISBN: </label>9781856046886 
<br/><br/><label>Dewey Class. No.: </label>025.5  / CAS