Karnazes, Dean, <br/><br/>
50/50 : 

 -  Grand Central Publishing,  2009. 
 - 304 pages 
<br/><br/><label>ISBN: </label>9780446581844 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sports & Recreation.
<br/><br/><label>Dewey Class. No.: </label>796.4252  / KAR