Algebra :   An elementary Text-Book fot the higher classes of secondary schools and for colleges / 
Chrystal  George . 
 - part II.2 
 - London :  Elibron Classics ,  2005. 
 - 338-616 p.: 
<br/><br/><label>ISBN: </label>1402151527 
<br/><br/><label>LC Class. No.: </label>Q152  / .C49  2005