Nelson, Paul N., Webb, Michael J., Berthelsen, Suzanne, Curry, George, Yinil, David, and Fidelis, Chris (2011) Nutritional status of cocoa in Papua New Guinea. ACIAR Technical Reports, 76 . Australian Centre for International Agricultural Research, Canberra, ACT, Australia.

Nelson, Paul, Webb, Michael, Berthelsen, Suzanne, Curry, George, Yinil, David, Fidelis, Chris, Fisher, Myles, and Oberthur, Thomas (2011) Nutritional status of cocoa in Papua New Guinea. Better Crops with Plant Food, 95 (2). pp. 18-20.

Nelson, Paul N., Fidelis, Chris, Webb, Michael J., Berthelsen, Suzanne, and Yinil, David (2010) Nutrient status of cocoa (Theobromae cacao) in Papua New Guinea: results from a survey. In: Proceedings of the 19th World Congress of Soil Science. pp. 71-74. From: 19th World Congress of Soil Science, 1-6 August 2010, Brisbane, QLD, Australia.