?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Stalenga%2C+Dr+Jaroslaw&rft.aulast=Stalenga&rft.aufirst=Jaroslaw&rft.date=2006&rft.title=Evaluation+of+the+organisation+and+economic+efficiency+of+organic+and+conventional+farms+in+the+Kujawsko-Pomorskie+voivodship&rft.genre=proceeding