?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Frost%2C+David&rft.aulast=Frost&rft.aufirst=David&rft.date=2005&rft.title=The+environmental+and+socio-economic+impacts+of+organic+farming+in+Wales+&rft.genre=proceeding