Ramakumar, R., <br/><br/>
Technical Demography  Textual Documents 
R.Ramakumar 
 - ist ed. 
 - New Delhi  New Age International ( P ) Limited  1986 
 - pg 219:  21cm. 
<br/><br/><label>ISBN: </label>9708522674365 
<br/><br/><label>Subjects--Index Terms: </label>Statistics Demography G- Statistics 
<br/><br/><label>Dewey Class. No.: </label>312