1. Westoff, Ch. F., R.G. Potter and Ph.C. Sagi, The third child, Princeton University Press, Princeton, 1963, pp. 79–107.
2. Freedman, R. and L. Bumpass, Fertility expectations in the United States: 1962-64, Population Index, 32(2), 1966, pp. 192–193.
3. This is suggested in: Freedman, R., G. Baumert and M. Bolte, Expected family size and family size values in West Germany, Population Studies, 13(2), 1959, p. 145.
4. Westoff, Ch.F. and R.H. Potvin, Higher education, religion and women’s family size orientations, American Sociological Review, 31(4), 1966, pp. 489–496.
5. Bumnass, L. and Ch.F. Westoff, The prediction of completed fertility, Demography, 6(4), 1969, p. 449. Freedman and Bumpass, op. cit. 2, 1966, table 9, p. 193.