Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
United States. Bureau of Labor Statistics,Black Americans : a decade of occupational change,Rev,"U.S. Dept. of Labor, Bureau of Labor Statistics,For sale by the Supt. of Docs., U.S. Govt. Print. Off.",1972,Bulletin,,,,https://cir.nii.ac.jp/crid/1130282272550262912