Natural resources management in agriculture?ÿbmethods for assessing economic and environmental impacts?£cedited by B.A. Shiferaw, H.A. Freeman, and S.M. Swinton 

 - Wallingford, UK   CABI Publishing.  2005 
 - xvi, 382pages.  illustration.  25 cm 
<br/><br/><label>ISBN: </label>851998283