Liu, Jia <br/><br/>
The evaluation of worldwide digital reference services in libraries / 
Jia Liu 
 - Oxford :  Chandos Publishing,  2007 
 - xv, 174 p. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>184334310X (hbk.)  RM404.70 1843343096 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electronic reference services (Libraries)--Evaluation