Lester L. Helms <br/><br/>
Introduction to probability theory : with contemporary applications 

 - W.H.Freeman and Company, New York  1997 
 - xii,351p 
<br/><br/><label>ISBN: </label>0-7167-3023-5 
<br/><br/><label>Dewey Class. No.: </label>519.1 Hel