Dr. Euler's fabulous formula : 
Nahin, Paul J. 
 - Princeton, NJ :  Princeton University Press,  2006 
 - xx, 380 p. :  ill.;  25 cm. 
<br/><br/><label>ISBN: </label>9780691118222 (cl : acid-free paper) | 0691118221 (cl : acid-free paper)