Barfield, Lon <br/><br/>
The User interface  concepts & design 
Lon Barfield 
 - Wokingham, Eng.  Addison-Wesley  1993 
 - 353 p. : ill. ; 24 cm. 
<br/><br/>p. 335-345. 
<br/><br/><label>ISBN: </label>0201544415 
<br/><br/><label>Subjects--Topical Terms: </label><br/>User interfaces (Computer systems)