1. Based on Census data for the 713 counties included in our sample
U.S. Department of Commerce & U.S. Bureau of the Census County and City Databook: A Statistical Abstract Supplement
1972, 1983
U.S. Government Printing Office
Washington, D.C
2. Time-Series Growth in the Female Labor Force
3. BarbaraBergmann
The Economic Emergence of Women
1986
Basic Books
New York