Encyclopedia of information systems and services 
edited by John Schmittroth, Jr. Martin Connors, Kathleen Young and Doris Morris Maxfield, associate editors 
 - 5th ed. 
 - Detroit, Mich.  Gale Research Co.  1983 
 - 1242 p. ; 29 cm. 
<br/><br/>Includes indexes 
<br/><br/><label>ISBN: </label>0810311380 
<br/><br/><label>LCCN: </label>82-18359 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Information Services--United States--Directories<br/>Information storage and retrieval systems--Directories<br/>Data libraries--United States--Directories