Brummelen, Glen Van <br/><br/>
Heavenly mathematics :  the forgotten art of spherical trigonometry / 
Glen Van Brummelen. 
 - USA:  Princeton University Press,  ©2013. 
 - 217 pages; 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>9781400844807 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Spherical trigonometry.
<br/><br/><label>Dewey Class. No.: </label>AV-Eb 516.24  / V219