United States. Bureau of Labor Statistics. Problems in Measurement of Expenditures on Selected Items of Supplementary Employee Remuneration: Manufacturing Establishments, 1953 : Bulletin of the United States Bureau of Labor Statistics, No. 1186 , Washington: U.S. Govt. Print. Off., January 1956, https://fraser.stlouisfed.org/title/4482, accessed on April 18, 2025.