U.S. Dept. of Labor. (1952). Labor yearbook no. 1-. U.S. Govt. Print Off.
Cita Chicago (17th ed.)U.S. Dept. of Labor. Labor Yearbook No. 1-. Washington: U.S. Govt. Print Off, 1952.
Cita MLA (9th ed.)U.S. Dept. of Labor. Labor Yearbook No. 1-. U.S. Govt. Print Off, 1952.
Atenció: Aquestes cites poden no estar 100% correctes.