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  The Mafulu Mountain People of British New Guinea - Robert W. Williamson - Google Books

  https://books.google.de/books?id=lJNYAgAAQBAJ

  A modern edition of Robert Williamson's readable but very readable account of the Mafulu people. Covers all aspects of their life. This is the complete text, together will all the almost 200 illustrations.

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  Dieter Steiner · Humanökologie: Skripten 1998/99, Politisches, 2.3 Politische Aspekte von Stammesgesellschaften

  http://www.humanecology.ch/index.php?lng=de&pag=13&spg=215&nav=3&sub=10&scy=351

  Humanökologie aus der Sicht des ehemaligen ETH Professors Dieter Steiner

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