?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Hoffmann%2C+Heide&rft.aulast=Hoffmann&rft.aufirst=Heide&rft.date=1998&rft.title=Ecological+Agriculture+as+a+strategy+to+sustainable+rural+development+as+demonstrated+in+a+Mexican+Project&rft.genre=proceeding