?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Bett%2C+Msc+Eric&rft.aulast=Bett&rft.aufirst=Eric&rft.date=2007&rft.title=The+Potential+Role+of+Organic+Soil+Fertility+Management+in+the+Kenya+Highlands&rft.genre=proceeding