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
"Umbadda, Siddig","Import policy in Sudan, 1966-1976",,"Development Studies and Research Centre, Faculty of Economic & Social Studies, University of Khartoum",1984,Monograph series (University of Khartoum),,,,https://cir.nii.ac.jp/crid/1130000798250332416