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. Office of the U.S. Trade Representative,2021 trade policy agenda and 2020 annual report of the President of the United States on the trade agreements program,,"Office of the United States Trade Representative, Executive Office of the President,William S. Hein, [printer]",2021,The Trade agreements program of the United States,,,,https://cir.nii.ac.jp/crid/1130570375069752616