Erickson, Jonathan <br/><br/>
Mactelecommunications 
/ Jonathan Erickson, William D. Cramer 
. - Berkeley  : McGraw-Hill, c1985
. - 212 p.  ; 24 cm. 
<br/><br/>Index 
<br/><br/><label>ISBN: </label>088134155X 
<br/><br/><label>Source: </label> Don 
<br/><br/><label>Universal Decimal Class. No.: </label>621.39