@book{freeman1981,
  address   = {New Haven, CT},
  author    = {Freeman, D.},
  publisher = {Human Relations Area Files},
  title     = {Some Reflections on the Nature of Iban Society},
  url       = {http://ehrafworldcultures.yale.edu/ehrafe/citation.do?method=citation&forward=browseCulturesFullContext&col=collection%28%27/eHRAF/ethnography/Asia/OC06%27%29&docId=oc06-019&tocOffsetId=tocPubInfoP},
  year      = {1981}
}