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 Philippines. National Statistics Office,Agusan del Sur in focus : its demographic and socio-economic profile,,"Republic of the Philippines, National Statistics Office",1999,UNFPA-NSO monograph,,,,https://cir.nii.ac.jp/crid/1130282269141614976