Katz, William A., <br/><br/>
Introduction to reference work / 

 - 6th ed. 
 - New York   McGraw-Hill,  1992. 
 - xvi, 255p. :   24 cm. 
<br/><br/>Includes bibliographical references and indexes. 
<br/><br/>v. 1. Basic information sources -- v. 2. Reference services and reference processes. 
<br/><br/><label>ISBN: </label>0070336385 0070336393  
<br/><br/><label>LC Class. No.: </label>Z711  / .K15 1992