Encyclopedia of information systems and services 
edited by John Schmittroth, (... et al.) 
 - 6th ed 
 - Detroit, Mich.  Gale Research Co.  1985 
 - 2v. 29cm 
<br/><br/> At head of title: 1985-86 
<br/><br/>Contents: v.1. International volume - v.2. United State volume 
<br/><br/><label>ISBN: </label>0810315378 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Information services--Directories<br/>Information storage and retrieval systems--Directories<br/>Electronic publishing--Directories<br/>Information networks--Directories<br/>Bibliographical services--Directories<br/>Electronic data processing--Directories