COHN, P.M <br/><br/>
Free rings and their relations 
/[by] P.M.Cohn 
 - 2nd ed. 
 - London  Academic press  1985 
 - xxvii, 588p.- 
 - London mathematical society monograph; no:19 .
<br/><br/> Includes Appendix, Bibliography & index. 
<br/><br/><label>ISBN: </label>121791521 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Rings
<br/><br/><label>Dewey Class. No.: </label>512.4