United States. Department of Labor Bureau of Labor Statistics. (1988). Supplement to employment and earnings. U.S. Department of Labor.
Citazione stile Chigago Style (17a edizione)United States. Department of Labor Bureau of Labor Statistics. Supplement to Employment and Earnings. U.S: U.S. Department of Labor, 1988.
Citatione MLA (9a ed.)United States. Department of Labor Bureau of Labor Statistics. Supplement to Employment and Earnings. U.S. Department of Labor, 1988.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.