Johnson, Robert M. <br/><br/>
A logic book / 
Robert M. Johnson 
 - Belmont, Ca. :  Wadsworth Publishing Co.,  1987 
 - 271 p. :  ill. ;  23 cm. 
<br/><br/>includes index. 
<br/><br/><label>ISBN: </label>0534068529 
<br/><br/><label>LCCN: </label>86-13212 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Logic