Coxeter, H.S.M. <br/><br/>
Non-Euclidean geometry 

 - 6th ed. 
 - Washington D.C.  The mathematical association of America  1998 
 - xviii,336p.  23 cm. 
 - Spectrum series .
<br/><br/><label>ISBN: </label>0883855224 
<br/><br/><label>Dewey Class. No.: </label>516.9,D,Cox  / _