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Hoofdtrekken der sociale struktuur in het westelijke binnenland van Sarmi
Leeden, Alexander C. van der, (1956)
Decentralisation and the constitutional status of local-level government in Papua New Guinea
Peasah, Joseph A., (1990)
Provincial initiatives in establishing forms of local-level government in Papua New Guinea
Peasah, Joseph A., (1991)
Consumption Tax: A solution or New Problem? & Economic Arguments for a New Consumption Tax.
Dwyer, T., (1992)
A review of biomass heating for UK homes and commercial applications
Dwyer, T., (2006)