United States. Bureau of Labor Statistics. "National Survey of Professional, Administrative, Technical, and Clerical Pay, Winter 1961-62 : Bulletin of the United States Bureau of Labor Statistics, No. 1346,"
National Survey of Professional, Administrative, Technical, and Clerical Pay
(1962).
https://fraser.stlouisfed.org/title/4570/item/497778, accessed on January 18, 2025.