United States. Bureau of Labor Statistics. Brief history of the American Labor movement. U.S. Government Printing Office.
Cita Chicago (17th ed.)United States. Bureau of Labor Statistics. Brief History of the American Labor Movement. Washington: U.S. Government Printing Office.
Cita MLA (8th ed.)United States. Bureau of Labor Statistics. Brief History of the American Labor Movement. U.S. Government Printing Office.
Atenció: Aquestes cites poden no estar 100% correctes.