Rowe, Evan Keith and Kittner, Dorothy Ruth. Digest of One Hundred Selected Health and Insurance Plans Under Collective Bargaining, Early 1958 : Bulletin of the United States Bureau of Labor Statistics, No. 1236 , Washington: U.S. Dept. of Labor, Bureau of Labor Statistics, October 1958, https://fraser.stlouisfed.org/title/4504, accessed on November 16, 2024.