Basson, A. H., O'Connor, D. J. <br/><br/>
Introduction to symbolic logic 

 - 3rd ed. 
 - London  University tutoral press  1968 
 - viii,175p. 
<br/><br/><label>ISBN: </label> 10s 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics<br/>Symbolic logic
<br/><br/><label>Dewey Class. No.: </label>511.3  / BAS