Elston, Robert C. <br/><br/>
Essentials of biostatitics / 
Robert C. Elston, William D. Johnson. 
 - 2nd edition. 
 - Singapore :  Info Access & Distribution Pte Ltd,  c1995. 
 - xii, 328 pages :  illustrations ;  23  cm. 
<br/><br/><label>ISBN: </label>9813047399