Stahl, Saul <br/><br/>
Gateway to modern geometry  Poincare half-plane / 

 - 2nd ed. 
 - Boston :  Jones & Bartlett Publishers ,  2008. 
 - viii+255 
<br/><br/><label>ISBN: </label>9780763753818 
<br/><br/><label>Subjects--Index Terms: </label>Geometry