著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL
"Elamin, Nasredin A. Hag and Mubarak, Amel Mustafa",Crop profitability and competitiveness under different farming technologies in Sudan : a case study of mechanized rainfed production in Gedaref area,,Winrock International Institute for Agricultural Development,1998,Issues in African rural development monograph series,,157360013X,,https://cir.nii.ac.jp/crid/1130282272914216832