?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=de+Wit%2C+Jan&rft.aulast=de+Wit&rft.aufirst=Jan&rft.date=2006&rft.title=Why+regionality+is+an+important+value+in+organic+agriculture%3A+the+case+of+the+Netherlands&rft.genre=proceeding