Walford's guide to reference material 
edited by Marilyn Mullay and Priscilla Schlicke 
 - 6th ed. 
 - London  Library Association  1993 
 - volume 1 ;  25 cm. 
<br/><br/> volume 2: edited by Alan Day and Joan M. Harvey 
<br/><br/><label>ISBN: </label>1856040445  v.2  RM538.20 
<br/><br/><label>LCCN: </label>94-157267 
<br/><br/><label>Subjects--Topical Terms: </label><br/>References books--Bibliography