Firth, R. J. <br/><br/>
Viewdata systems :  a practical evaluation guide / 
R. J. Firth 
 - Manchester :  NCC Publications,  1982 
 - 86 p. (ie 114)p. :  ill. ;  22 cm. 
 - Office technology in the'80s .
<br/><br/>Bibliography: p81 
<br/><br/><label>ISBN: </label>0850123704 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Videotex (Data transmission system)<br/>Viewdata (Data transmission system)