United States Chamber of Commerce. Fringe Benefits, Biennial Survey, 1951–1965, Washington, D.C.
2.
United States Chamber of Commerce. Employee Benefits, 1967 and 1969, Washington, D. C.
3.
United States Department of Labor, Bureau of Labor Statistics. Employer Expenditures for Selected Supplementary Remuneration Practices for Production Workers, 1959, Bulletin No. 1308, Government Printing Office, Washington, D. C.
4.
United States Department of Labor, Bureau of Labor Statistics. Composition of Payroll Hours in Manufacturing Industries, 1962, Bulletin No. 1428, Government Printing Office, Washington, D. C.
5.
United States Department of Labor, Bureau of Labor Statistics. Employee Compensation in the Private Non farm Economy, 1966, Bulletin No. 1627, Government Printing Office, Washington, D. C.
6.
United States Department of Labor, Bureau of Labor Statistics. Employee Compensation in the Private Nonfarm Economy, 1968, Bulletin No. 1722, Government Printing Office, Washington, D. C.
7.
United States Department of Labor, Bureau of Labor Statistics. Monthly Labor Review, 1949–1971, various issues.
8.
United States Department of Commerce, Bureau of the Census, Current Population Survey, No. 216, March 8, 1971.