?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=A+H&rft.au=Kassam%2C+A+H&rft.aulast=Kassam&rft.isbn=978-1-78064-259-8+&rft.date=2013&rft.title=Summing+up+&rft.tpages=424&rft.btitle=Conservation+agriculture%3A+global+prospects+and+challenges&rft.genre=bookitem