Kruzas, Anthony T. <br/><br/>
Encyclopedia of informationsystems and services 
Anthony T. Kruzas editor Linda Varekamp Sullivan 
 - Detroit, Mich.  Gale Research Co.  1978 
 - xii, 1030 p. ; 30 cm. 
<br/><br/><label>ISBN: </label>0810309408 
<br/><br/><label>LCCN: </label>78-014575 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Information Services--United States--Directories<br/>Information storage and retrieval systems--Directories