Steen, S. W. P. <br/><br/>
Mathematical logic with special reference to the natural numbers 
[by] S. W. P. Steen. 
 - Cambridge.  University Press,  1972. 
 - xvi, 638 p.;  24 cm. 
<br/><br/>Bibliography: p. 621-630. 
<br/><br/><label>ISBN: </label>0521080533 
<br/><br/><label>Dewey Class. No.: </label>511.3 STE