Ackermann, Robert. <br/><br/>
Nondeductive inference. 

 - London  Routledge & Kegan Paul         1966 
 - v,130 p.  Includes bibliographical references and index.  cm. 
<br/><br/> Bobliography : P.124-129; Monographs in modern logic. 
<br/><br/><label>Source: </label> Reference