"Clesceri, Lenore. S" <br/><br/>
Standard Methods 

 - Seventeenth 
 - New Delhi  Panima Educational Book  1989 
 - l-76 
<br/><br/><label>ISBN: </label>087553161X 
<br/><br/><label>Dewey Class. No.: </label>544  / 1 AME