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
"Usoro, Eno J.","The Nigerian oil palm industry : (Government policy and export production, 1906-1965)",,Ibadan University Press,1974,Ibadan social science series,,,,https://cir.nii.ac.jp/crid/1130000795488208512