Keyfitz, Nathan, <br/><br/>
Applied Mathematical Demography :  Statistics for Biology and Health /  Textual Documents 
By Nathan Keyfitz & Hal Caswell . 
 - 3rd ed. 
 - New Delhi  Springer-Verlag  1977 
 - pg 555:  23cm. 
<br/><br/><label>ISBN: </label>9780387225371 
<br/><br/><label>Subjects--Index Terms: </label>Statistics G- Statistics Mathematical Demography 
<br/><br/><label>Dewey Class. No.: </label>304.6