A First course in probability / 
Sheldon Ross. 
 - 5th ed. 
 - New Jersey :  Prentice Hall,  1998. 
 - xiv,514 p,: 
<br/><br/><label>ISBN: </label>0137463146 
<br/><br/><label>LC Class. No.: </label>QA273  / .R67 1998