Mendelson, Elliott <br/><br/>
Introduction to mathematical logic ed. 2 

 - 2nd 
 - London  D.Van Nostrand Co.  1979 
 - vii,220p. p. 
<br/><br/><label>ISBN: </label>0-442-25307-9 
<br/><br/><label>Subjects--Index Terms: </label>Logic,symbolic and mathematical