1. Briggs, E. A. (1928). New Guinea—land of the devil devil. Australian Museum Magazine, 3, 265–273.
2. Briggs, E. A. (1929). The black heart of New Guinea. Australian Geographer, 1, 38–40.
3. Foley, W. A. (1986). The Papuan languages of New Guinea. Cambridge: Cambridge University Press.
4. Laycock, D. C. (1975). The Torricelli phylum. In S. A. Wurm (Ed.), Papuan languages and the New Guinea linguistic scene, 1, 767–780.
5. Malcolm, L. A. (1973). Growth and development patterns and human differentiation in Papua New Guinean communities. Prepared for the IXth International Congress of Anthropological and Ethnological Sciences, August–September 1973, at Chicago, IL.