Spencer, Richard, H. <br/><br/>
Computer usability testing and evaluation 

 - New Jersey: Prentice-Hall  1985 
 - xii, 224p.  22 cm. 
<br/><br/><label>ISBN: </label>0131640887 
<br/><br/><label>Dewey Class. No.: </label>001.64,  / spe