Higher arithmetic : 
Davenport, Harold, 
 - 7th ed. 
 - Cambridge :  Cambridge University Press,  1999 
 - 241 p. :  ill. ;  24 cm. 
<br/><br/> Previous ed.: 1992. 
<br/><br/><label>ISBN: </label>0521632692 | 0521634466 (pbk.)