Provinsi Tengah, Papua Nugini: Perbedaan antara revisi

* Hanson, L.W., Allen, B.J., Bourke, R.M. and McCarthy, T.J. (2001). Papua New Guinea Rural Development Handbook. Land Management Group, Research School of Pacific and Asian Studies, The Australian National University, Canberra. Tersedia dalam wujud [httphttps://web.archive.org/web/20050720062937/http://rspas.anu.edu.au/papers/lmg/PNG_rdh.pdf PDF sebesar 30 Megabyte].