Network   : workbook 
/ John Eastwood, Valerie Kay, Ronald Mackin, ... 
. - London  : Oxford University Press, 1981
. - 2 v.  ; 25 cm. 
<br/><br/> V.2 : 102 p. 
<br/><br/><label>ISBN: </label>0194570584 
<br/><br/><label>Source: </label> Don britannique 
<br/><br/><label>Universal Decimal Class. No.: </label>802.0