Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL United States. Bureau of Labor Statistics,"National compensation survey : Boston-Worcester-Lawrence, MA-NH-ME-CT, August 1997",Rev. Mar. 1999,"U.S. Dept. of Labor, Bureau of Labor Statistics",1999,Bulletin,,,,https://cir.nii.ac.jp/crid/1130282272202839680