Gaskin,James E. <br/><br/>
Talk is Cheap  switching to internet telephones 

 - Shroff Publishers & Distributors Pvt. Ltd., Mumbai  2005 
 - xvi,262 
<br/><br/><label>ISBN: </label>81-8404-053-9 
<br/><br/><label>Dewey Class. No.: </label>621.38212 Gas