United States. Bureau of Labor Statistics. Consumer Expenditure Survey Series: Interview Survey, 1972-73: Annual Expenditures and Sources of Income Cross-Classified by Family Characteristics, (1972 and 1973 Combined) : Bulletin of the United States Bureau of Labor Statistics, No. 1985 , Washington, D.C: The Bureau, August 1978, https://fraser.stlouisfed.org/title/4685, accessed on March 13, 2025.