T. Pradeepkumar, B. Sumajyothibhaskar, and K.N. Satheesan. (2008). Management of Horticultural Crops (Horticulture Science Series Vol.11, 2nd of 2 Parts). New India Publishing. pp. 539–587. ISBN978-81-89422-49-3.
Bourke, R. Michael and Tracy Harwood (Eds.). (2009). Food and Agriculture in Papua New Guinea. Australian National University. p. 327. ISBN978-1-921536-60-1.