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 South Africa. Dept. of Statistics,"Major industry group : electrical machinery, apparatus, appliances and supplies = Nywerheidshoofgroep : elektriese masjinerie, apparaat, toestelle en voorrade",,[Bureau of Statistics],1967,"Nywerheidsensusse, 1950-51 tot 1960-61 = Industrial censuses, 1950-51 to 1960-61",,,,https://cir.nii.ac.jp/crid/1130000795073219584