1. BERELSON, B. et al, Family Planning and Population Programs, Chicago, 1966.
2. Estimated refined measures of fertility for all major countries of the world;CHO;Demography,1964
3. Demography, Progress and problems of fertility control around the world. Special issue, vol. 5, no. 2 (1968).
4. GLASS, D. V. and GREBENIK, E., The Trend and Pattern of Fertility in Great Britain: A Report of the Family Census of 1946, 1954.
5. Rural-urban distribution of fertilities in South Island, New Zealand;HEENAN;Ann. Assoc. Amer. Geographers,1967