1. Adamo, S. (2008). Addressing environmentally induced population displacements: A delicate task. Background article for the population-environment research network cyberseminar on “Environmentally Induced Population Displacements”, 20 pp. Available at www.populationenvironmentresearch.org .
2. Barbieri, A. F., Bilsborrow, R. E., & Pan, W. K. (2006). Farm household lifecycles and land use in the Ecuadorian Amazon. Population and Environment, 27(1), 1–27.
3. Barbieri, A. F., Carr, D., & Bilsborrow, R. (2009). Migration within the frontier: the second generation colonization in the Ecuadorian Amazon. Population Research and Policy Review, 28(3), 291–320.
4. Becker, G. S. (1964). Human capital: A theoretical and empirical analysis, with special reference to education. New York: National Bureau of Economic Research; distributed by Columbia University Press.
5. Bettrel, C. B., & Hollifield, J. F. (2000). Migration theory. In C. B. Bettrel & J. F. Hollifield (Eds.), Migration theory: Talking across disciplines. New York: Routledge.