1. Ackermann, Fritz L., 1963, O lago Arari da ilha de Marajó e seus problemas. Revista Brasileira de Geografia XXV (2): 273–276.
2. Arnold, Jeanne E. (ed.), 2001, The Origins of a Pacific Coast Chiefdom: The Chumash of the Channel Islands. University of Utah Press, Salt Lake City.
3. Bevan, Bruce W. and Anna C. Roosevelt, 2003, Geophysical exploration of Guajará, a prehistoric earth mound in Brazil. Geoarchaeology: An International Journal 18 (3): 287–331.
4. Carneiro, Robert L., 1995, The history of ecological interpretations of Amazonia: does Roosevelt have it right? In Indigenous Peoples and the Future of Amazonia, edited by Leslie E. Sponsel, pp. 45–70. The University of Arizona Press, Tucson.
5. Carneiro, Robert L., ms., The Ecological Basis of Amazonian Chiefdoms. Unpublished paper. 88 pp.