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 "Nigerian Institute of Social and Economic Research and Olatunbosun, Dupe",Western Nigerian farm settlement : an appraisal,,The Ibadan University Press,1972,N. I. S. E. R. Reprint series,,,,https://cir.nii.ac.jp/crid/1130282273253557504