Cohn, P. M., <br/><br/>
Free rings and their relations / 
by P.M. Cohn 
 - London :  Academic Press for the London Mathematical Society,  1971 
 - xvi, 346 p. :  ill. ;  24 cm. 
 - L.M.S. monographs .
 - L.M.S. monographs .
<br/><br/>Includes bibliographical references (p. 327-339) and index 
<br/><br/><label>ISBN: </label>0121791505 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Associative rings