Crossley, J. N.  <br/><br/>
What is mathematical logic? 

 - London  Oxford University Press  1972 
 - ix, 82 p.  Includes index 
<br/><br/><label>ISBN: </label>0198880871 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics<br/>Mathematics- Calculus<br/>Mathematics- Recursive Functions