Galois theory  
Stewart, Ian, 
 - 2nd ed. 
 - Boca Raton, :  Chapman & Hall/CRC,  1998 
 - xxx, 288 p. :  ill. ;  24 cm. 
<br/><br/> Previously published: London ; New York : Chapman and Hall, 1989. 
<br/><br/><label>ISBN: </label>0412345501 (acid-free paper)