United States. Bureau of Labor Statistics. Division of Occupational Outlook. "A Guide to Labor-Management Relations in the United States. Supp. 2 : Bulletin of the United States Bureau of Labor Statistics, No. 1225-2," A Guide to Labour-Management Relations in the United States (July 1959). https://fraser.stlouisfed.org/title/4569/item/495747, accessed on September 8, 2024.