United States. Department of Labor Bureau of Labor Statistics. (1988). Supplement to employment and earnings. U.S. Department of Labor.
Chicagoスタイル(17版)引用形式United States. Department of Labor Bureau of Labor Statistics. Supplement to Employment and Earnings. U.S: U.S. Department of Labor, 1988.
MLA(9版)引用形式United States. Department of Labor Bureau of Labor Statistics. Supplement to Employment and Earnings. U.S. Department of Labor, 1988.
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