1. Aguirre, A. (Editor) (2002). Conservation Medicine: ecological health in practice. Oxford University Press, Oxford, UK.
2. Allen, T.H.F., and Hoekstra, T.W. (Editors). 1992. Toward a Unified Ecology. Complexity in Ecological Sciences Series. Columbia, New York, NY, USA.
3. Allen, T.F.H., Bandursky, B.L., and King, A.W. (1993). The Ecosystem Approach: Theory and Ecosystem Integrity. A Report to the International Joint Commission of the Great Lakes. International Joint Commission¸ Washington, DC, USA.
4. Berkes, F., and Folke, C. (Editors). (1998). Linking Social and Ecological Systems. Cambridge University Press, Cambridge, UK.
5. Bernard, H.R. (2000). Social Research Methods. Qualitative and Quantitative Approaches. Sage Publications: Thousand Oaks, CA. USA.