United States. Bureau of Labor Statistics , Finn, Joseph T. and Wood, Frank L. Labor and Material Requirements for Private Multifamily Housing Construction : Bulletin of the United States Bureau of Labor Statistics, No. 1892 , Washington, D.C: U.S. Dept. of Labor, Bureau of Labor Statistics, 1976, https://fraser.stlouisfed.org/title/4764, accessed on January 23, 2026.