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

 - 5th 
 - Toronto:  Toronto University,  1968 
 - xv, 309p. Index 
 - Mathematical expositions  no. 2 .
<br/><br/><label>Dewey Class. No.: </label>516  / C879.NG