Non-Euclidean Geometry:/  a critical and historical study of its development 
Bonola,Roberto...[et al]. 
 - New York:  Dover Publications,  2010. 
 - various paper 
<br/><br/><label>ISBN: </label>0486600270 
<br/><br/><label>Dewey Class. No.: </label>516  / BON/N