Heim, Michael <br/><br/>
The metaphysics of virtual Reality / 
Michael Heim 
 - New York :  Oxford university Press,  1993       
 - xxiii, 175 p. 
<br/><br/><label>ISBN: </label>0195081781 
<br/><br/><label>LC Class. No.: </label>QA 76.9 H467m 1993