Steen, S. W. P. (Stourton William Peile). <br/><br/>
Mathematical logic  with special reference to the natural numbers / 
by S.W.P. Steen. 
 - London :  Cambridge University Press,  1972. 
 - xvi,638 p. ;  24 cm. 
<br/><br/>Bibl. p. 621-630. and index. 
<br/><br/><label>ISBN: </label>0521080533 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Logic, Symbolic and mathematical.<br/>Numbers, Natural.