An Introduction to biostatistics  a manual for students in health services 
P.S.S. Sundar Rao. 
 - 3rd ed. 
 - New Delhi  Prentice Hall India  [n.d.] 
 - xi, 259p., 24cm. 
<br/><br/><label>ISBN: </label>81-203-1008-x. 
<br/><br/><label>Dewey Class. No.: </label>574.015195  / R19I