Stilltoe, Paul (1983). Roots of the Earth: Crops in the Highlands of Papua New Guinea. Manchester, UK: Manchester university Press. ISBN978-0-7190-0874-0. LCCN82-62247. OCLC9556314.
Stilltoe, Paul (1983). Roots of the Earth: Crops in the Highlands of Papua New Guinea. Manchester, UK: Manchester university Press. ISBN978-0-7190-0874-0. LCCN82-62247. OCLC9556314.