Johnson, Norman L. <br/><br/>
Urn models and their applications; approach to modern discrete probability theory  / 

 - New York:  John Wiley,  1977 
 - xiii, 402p. Index 
 - Wiley series in Probability and Mathematical Statistics .
<br/><br/><label>Dewey Class. No.: </label>519.2  / J68.UM