Coba jelasin Catatan dari Suku Penan dong

Sarawak Peoples Campaign, Ian Mackenzie, accessed 2005-04-05

Nomads of the Dawn, The Penan of the Borneo Rainforest, Chapter

Clifford Sather, "Sea Nomads and Rainforest Hunter-Gatherers:Foraging Adaptions in the Indo-Malaysian Archipelago" in "The Austronesians - Historical and Comparative Perspectives" p268, Canberra 1995/2006

Malaysia Environmental Profile Rhett A. Butler