1. The shape of high fertility among the Wenger Mennonites;Hurd,2006
2. Methods of estimating basic demographic measures from incomplete data;Coale,1967
3. The methods and materials of demography, Table 10–5;Shryock,1975
4. Maternal age and spontaneous abortion in human embryonic and fetal death;Stein,1980
5. The age of spontaneous abortion;Shiina;Hokkaido Igaku Zasshi,1984