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 United States. Bureau of Labor Statistics,"Proceedings of the seventh annual convention of the association of governmental labor officials of the United States and Canada held at Seattle, Wash., July 12-15, 1920",,U.S. G.P.O.,1921,Bulletin,,,,https://cir.nii.ac.jp/crid/1130282270330891264