1. Agriculture in the Papua New Guinea Economy;Shaw;Institute of National Affairs Discussion Paper No 20,1985
2. The geographyof Papua New Guinea;Allen,1992
3. See B J Allen, ‘Agriculture in Papua New Guinea: background for PLEC’, PLEC News and Views, No 1, pp 21–25
4. The sago palms and other food plants of marsh dwellers in the Pacific Islands;Barrau;Economic Botany,1959
5. Sago in Melanesia;Crosby;Archaeology and Physical Anthropology in Oceania,1976