Simpson, R L . <br/><br/>
Essentials of symbolic logic /  
by R.L. Simpson. 
 - London :   Routledge ,   1987. 
 - iv, 193p. :   ills.,figs.,tables ;   23cm .  
<br/><br/>Includes index 
<br/><br/><label>ISBN: </label>0415018706  UKP 8.95 
<br/><br/><label>Subjects--Index Terms: </label>LOGIC, SYMBOLIC AND MATHEMATICAL 
<br/><br/><label>Dewey Class. No.: </label>511.3  / SIM/E