United States. Bureau of Labor Statistics. Brief history of the American Labor movement. U.S. Government Printing Office.
芝加哥风格引文United States. Bureau of Labor Statistics. Brief History of the American Labor Movement. Washington: U.S. Government Printing Office.
MLA引文United States. Bureau of Labor Statistics. Brief History of the American Labor Movement. U.S. Government Printing Office.
警告：这些引文格式不一定是100％准确.