Grant, Cameron (август 2007). „Damaged Dirt”(PDF). The Advertiser. Архивирано из оригинала(PDF) 6. 7. 2011. г. Приступљено 23. 4. 2010. "Australia has the oldest, most highly weathered soils on the planet."
"The team also dated features consistent with the planting, digging, and tethering of plants and localized drainage systems to 10,000 years ago. Mounds constructed to plant water-intolerant plants such as bananas, sugarcane, and yams are dated to about 6,500 years ago." "Was Papua New Guinea an Early Agriculture Pioneer?" By John Roach, for National Geographic News, June 23, 2003
Grant, Cameron (август 2007). „Damaged Dirt”(PDF). The Advertiser. Архивирано из оригинала(PDF) 6. 7. 2011. г. Приступљено 23. 4. 2010. "Australia has the oldest, most highly weathered soils on the planet."