1. Sweet Potato Marketing in PNG Highlands;Chang,2007
2. Cash income from agriculture;Allen,2009
3. Improving the marketing systems for fresh produce from the Highlands of Papua New Guinea;Spriggs,2003
4. Factors affecting consumers' willingness to pay for good quality sweet potato in Papua New Guinea;Villano;Australasian Agribusiness Review,2016
5. Dimension of PNG village agriculture;Bourke,2000