?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=S&rft.au=Ngulube%2C+S&rft.aulast=Ngulube&rft.atitle=Economics+of+groundnut+production+in+Malawi&rft.title=International+Arachis+Newsletter&rft.issn=1010-5824&rft.date=2001&rft.volume=21&rft.pages=55-57&rft.genre=article