Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
United States. Bureau of Labor Statistics,"Union security and checkoff provisions in major union contracts, 1958-59",,"U.S. Dept. of Labor, Bureau of Labor Statistics,For sale by the Supt. of Docs., U.S. Govt. Print. Off",1960,Bulletin,,,,https://cir.nii.ac.jp/crid/1130000796973150848