Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
United States. Bureau of Labor Statistics,"Paid holiday provisions in major union contracts, 1958",,"U.S. Dept. of Labor, Bureau of Labor Statistics,For sale by the Supt. of Docs., U.S. Govt. Print. Off.",1959,Bulletin,,,,https://cir.nii.ac.jp/crid/1130282272648572032