Liu, Jia <br/><br/>
The evaluation of worldwide digital reference services in libraries 
Jia Liu. 
 - Oxford  Chandos  2007. 
 - xv, 174 p.  ill.  24 cm. 
 - Chandos information professional series .
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>1843343096 (pbk.) 
<br/><br/><label>Nat. Bib. No.: </label>GBA735513 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electronic reference services Libraries--Evaluation.
<br/><br/><label>LC Class. No.: </label>Z711.45  / .L58 2007 
<br/><br/><label>Dewey Class. No.: </label>025.520285  / L7831e