Schenkman, Eugene. <br/><br/>
Group Theory /  
by Eugene Schenkman. 
 - 1st ed /  
 - New Delhi :   Affiliated East-West Press Private Ltd. ,   1997 
 - p289 :  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Homomorphism normal Subgroup
<br/><br/><label>Dewey Class. No.: </label>B27  / N71