United States. Bureau of Labor Statistics. (1918). Monthly labor review. G.P.O..
Cita Chicago (17th ed.)United States. Bureau of Labor Statistics. Monthly Labor Review. Washington: G.P.O., 1918.
Cita MLA (9th ed.)United States. Bureau of Labor Statistics. Monthly Labor Review. G.P.O., 1918.
Atenció: Aquestes cites poden no estar 100% correctes.