1. Berelson, B., Population policy in developed countries. Population Council, New York, 1974.
2. Berent, J., Causes of fertility decline in Eastern Europe and the Soviet Union. Population Studies, vol. 24, no. 1, 1970a, pp. 35–58, and vol. 24, no. 2, 1970a, pp. 247-292.
3. Berent, J., Aspects démographiques de l’emploi des femmes en Europe Orientale et en URSS (Demographic aspects of female employment in Eastern Europe and the Soviet Union), Revue Internationale du Travail, vol. 101, no. 2, 1970b, pp. 191–210.
4. Bielli, C., A. Pinnelli and A. Russo, Fecondità e lavoro della donna; Un’indagine in quattro zone tipiche italiane (Fertility and female work; A survey in four typical Italian areas), Instituto di Demografia, Rome, 1973.
5. Bielli, C., D. Maffioli, A. Pinnelli and F. Zannella, Fecondità e lavoro della donna in ambiente urbano (Fertility and female work in urban areas), Instituto di Demografia, Rome, 1975.