1. Systems of Land Tenure in Borneo: A Problem in Ecological Determinism;Appell;Borneo Research Bulletin,1971
2. The Distinction Between Ethnography and Ethnology and Other Issues in Cognitive Structuralism;Appell;Bijdragen tot de Tall-, Landen Volkenkunde,1973
3. Taking Ethics: The Uses of Moral Rhetoric and the Function of Ethical Priciples;Appell;Social Problems,1980a