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
"Usman, Yusufu Bala, b. 1945","The transformation of Katsina, 1400-1883 : the emergence and overthrow of the sarauta system and the establishment of the emirate",,Ahmadu Bello University Press,1981,Ahmadu Bello University history series,,,,https://cir.nii.ac.jp/crid/1130282272103115520