Practical statistics 
By S.S. Chadha 
 - 4th ed. 
 - New delhi:  S. Chand & company ltd.,  1983. 
 - x,796p. 
<br/><br/><label>Subjects--Index Terms: </label>Commerce Practical statistics 
<br/><br/><label>Dewey Class. No.: </label>519.5