?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Padel%2C+Susanne&rft.aulast=Padel&rft.aufirst=Susanne&rft.date=2007&rft.title=Principles+of+organic+agriculture+and+the+market+place&rft.genre=proceeding