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 India. Office of the Registrar General. Social Studies Division,Ageing population of India : an analysis of the 1991 census data : a study report in the analytical study report series based on the 1991 census data,,Controller of Publications,1999,"Census of India, 1991",,,,https://cir.nii.ac.jp/crid/1130000795004681472