Gable, Robert A. <br/><br/>
Toll-free services :  a complete guide to design, implementation, and management / 
Robert A. Gable. 
 - Boston ;  London :  Artech House,  c1995. 
 - XIII, 186 stron :  ilustracje ;  24 cm. 
<br/><br/>Bibliografia na stronach 175-178. Indeks. 
<br/><br/><label>ISBN: </label>0890067872 (acid-free paper) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Toll-free telephone calls--United States.