Katz, William A. <br/><br/>
Introduction to reference work. 2v :  Reference services&reference processes / 

 - 6th ed. 
 - McGraw Hill :  New York ,  1992. 
 - xvi+255  23cms 
 - McGraw Hill series in library education .
<br/><br/> 2 
<br/><br/><label>ISBN: </label>0070336383 
<br/><br/><label>Subjects--Index Terms: </label>Library Science Reference Service