Cassell, Kay Ann <br/><br/>
Reference and information services in the 21st century : an introduction / 

<br/><br/>Includes bibliographical references and index.<br/> 
<br/><br/><label>Subjects--Topical Terms: </label><br/>1. Reference services (Libraries). <br/>2. Electronic reference services (Libraries). <br/>3. Reference books-Bibliography. <br/>4. Electronic reference services-Directories.
<br/><br/><label>Dewey Class. No.: </label>Res. 025.524 C344r 2009