?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Yousif%2C+H.M.&rft.aulast=Yousif&rft.aufirst=H.M.&rft.date=1995&rft.title=Rural+population+settlements+and+the+environment+in+central+Sudan&rft.btitle=Population-Environment-Development+Interactions&rft.genre=bookitem