WHO guidelines for the safe use of wastewater, excreta and greywater :  policy and regulatory aspects / 
World Health Organization. 
 - Geneva, SW :  WHO,  2006. 
 - 4 volumes :  ill ;  25cm. 
<br/><br/>Includes index. 
<br/><br/> Open access. 
<br/><br/><label>ISBN: </label>9241546824 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water-supply.<br/>Water-supply--Legislation.<br/>Agriculture.<br/>Aquaculture.<br/>Sewage.<br/>Sewage disposal plants.