Stokes, Adrian V. <br/><br/>
Viewdata :  a public information utility / 
Adrian V. Stokes 
 - 2nd ed. 
 - Hants :  Gower Publishing,  1980 
 - 133 p. :  ill. ;  30 cm. 
 - The Langton information system series .
<br/><br/><label>ISBN: </label>05-897-536 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Videotex (Data transmission system)<br/>Teletext (Data transmission system)