Katz, David. L.; Elmore, Joann. G.; Wild, Dorothea. M. G; Lucan, Sean. C <br/><br/>
Jekel's Epidemiology, Biostatistics, Preventive Medicine, and Public Health 

 -  Elsevier  2014 
 - 405 
<br/><br/><label>ISBN: </label>978-1-4557-0658-7