Ribenboim, Paulo. <br/><br/>
Rings and modules / 
Paulo Ribenboim. 
 - New York :  Interscience Publishers,  1969. 
 - vii, 162 p. :  ill. ;  23 cm. 
<br/><br/>p. 157. 
<br/><br/><label>ISBN: </label>470718056A 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Rings (Algebra).<br/>Modules (Algebra).