Directory of special libraries and information centers / 
edited by Margaret Labash Young, Harold Chester Young and Anthony T. Kruzas 
 - 4th ed. 
 - Detroit, Mich. :  Gale Research,  1977- 
 - v. ;  29 cm. 
<br/><br/><label>ISBN: </label>081030290X 
<br/><br/><label>LCCN: </label>76-048854 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Special libraries--United States--Directories<br/>Special libraries--Canada--Directories<br/>Information Services--United States--Directories<br/>Information services--Canada--Directories