1. W. Farr, Vital statistics or the statistics of health, sickness, disease and death reprinted in
2. Mortality in mid-nineteenth century Britain;Wall,1974
3. Chester Beatty Research Institute serial abridged life tables, England and Wales, 1841–1960;Case,1962
4. Population analysis in geography;Woods,1979
5. World population; an analysis of vital data;Keyfitz,1968