Tobelo : ideas and values of a North Moluccan society / Josephus Dominicus Maria PlatenkampNorth Halmahera: non-Austronesian languages, Austronesian cultures? : lecture presented to the Oosters Genootschap in Nederland at Leiden on 23 May 1989 / by J.D.M. PlatenkampDe waarde der dingen : ceremoniële geschenken van de Tobelo / J.D.M. Platenkamp ; [red. en samenst. Anne-Marie Boer ; catalogus Jet Bakels ; foto's Jos Platenkamp ... et al.]Multilinguality, multiple origins : language and cultural identity in Tobelo, North Moluccas / J.D.M. PlatenkampTransforming Tobelo ritual : Christianity and its impact on a holistic ideology / by J.D.M. PlatenkampThe Jonglei Canal : its impact on an integrated system in the southern Sudan / Jos D.M. Platenkamp