1. Goldsmith Harold F., Rosen Beatrice M., Shambaugh J. Philip, Stockwell Edward G., and Windle Charles D.: 1975, Demographic Norms for Metropolitan, Nonmetropolitan and Rural Counties (Mental Health Study Center, National Institute of Mental Health, Adelphi, Maryland), p. 43.
2. Shambaugh, J. Philip, Windle, Charles D., Lawrence, Linda, Goldsmith, Harold F., and Rosen, Beatrice M.: 1975, Demographic Norms of Community Mental Health Center Catchment Areas (National Institute of Mental Health, Mental Health Demographic Profile System Working Paper No. 21, Rockville, Maryland).
3. Sherwood Mark K.: 1977, ?The measure of poverty: Technical paper IV (Bureau of Labor Statistics Family Budget Program, Department of Health, Education and Welfare, Washington, D.C.), p. 39.
4. U.S. Bureau of the Census: 1977, Current Population Reports, Series P-60, No. 105, ?Money income in 1975 of families and persons in the United States (U.S. Government Printing Office, Washington, D.C.).
5. N.I.M.H. Series C;Beatrice M. Rosen,1975