1. Ageing in developing countries;Kalache, A.,1991
2. Elderly people at village level in Botswana. Yearbook of population research 1996: 243– 61;Ingstad, B.; Brunborg, H.; Bruun, F.
3. Care for the elderlycare by the elderly-the role of elderly women in changing Tswana society;Ingstad, B.; Bruun, F.; Sandberg, E.;Journal of Cross-cultural Gerontology,1996
4. Population and housing census;Central Statistics OYce,1991
5. Definition of chronic energy deficiency in adults. Report of a Working Party of the International Dietary Energy Consultative Group;James, W.P.T.;Eur J Clin Nutr,1988