1. - 1976: Fishing for wallabies: trade as a mechanism of social interaction, integration and elaboration on the central Papuan coast. In Rowlands, M. and Friedman, J. editors, The evolution of social systems. Duckworth, 419-55.
2. - 1977a: Sea traffic, trade and expanding horizons. In Allen, J., Golson, J. and Jones, R., editors, Sunda and Sahul: prehistoric studies in southeast Asia, Melanesia and Australia . Academic Press, 387-417.
3. - 1977b: Adaptations to the food quest in prehistoric Papua New Guinea. In Megaw, J.V.S. editor, Hunters, gatherers, and first farmers beyond Europe. Leicester University Press, 167-88.