420 <br/>
<br/> Dorothy Neal <br/>
          Telephone Techniques 2nd edition 
  
 - 0 
.- New York, New York, USA.: Glencoe/ McGraw-Hill, 1998
.- 148p., 
-ISBN  .: 0 
 <br/>  -  0 
<br/><br/><label>Source: </label> Худалдаж авсан 
<br/><br/><label>Тавиурын заалт: </label>420