Velleman, D.J <br/><br/>
How to prove it  structured approach 
D.J. Velleman 
 - Cambridge  Cambridge University Press  1994 
 - ix  309 
<br/><br/><label>ISBN: </label>9780521446631 
<br/><br/><label>Dewey Class. No.: </label>1.01+18+19  / VELL