Network   : teacher's book  
/ John Eastwood, Valerie Kay, Ronald Mackin, ... 
. - London   : Oxford University Press, 1980
. - 3 v.  ; 25 cm. 
<br/><br/> V.1 : 175 p. 
<br/><br/><label>ISBN: </label>0194570525 
<br/><br/><label>Source: </label> Don britannique 
<br/><br/><label>Universal Decimal Class. No.: </label>802.0