?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Lee%2C+Howard&rft.aulast=Lee&rft.aufirst=Howard&rft.date=2002&rft.title=A+critique+of+methodologies+for+the+comparison+of+organic+and+conventional+farming+systems&rft.genre=proceeding