Sanford, David H <br/><br/>
If P, Then Q   Conditionals and the Foundations of Reasoning 

 - London  Routledge  1989 
 - 265p 
<br/><br/> includes index and biblioraphy 
<br/><br/><label>ISBN: </label>0415079942     200 
<br/><br/><label>Dewey Class. No.: </label>N10  / SA576