1. (IUCN) International Union for Conservation of Nature (2011). Red List of Threatened Species. http://www.iucn.org/about/work/programmes/species/red_list/ . Date accessed 1 Sept 2011.
2. Armstrong, M. C., Farinato, R. H., & Telecky, T. M. (2001). A wing and a prayer: birds and their protection under law. Journal of Avian Medicine and Surgery, 15(4), 310–315.
3. Baker, S. (2003). An analysis of timber trespass and theft issues in the southern Appalachian Region. Masters in Science in Forestry. Blacksburg, VA: Virginia Polytechnic Institute.
4. Cantu, J. C. G., Saldana, M. E. S., Grosselet, M., & Gamez, J. S. (2007). The illegal parrot trade in Mexico: A comprehensive assessment. Mexico and Washington, DC: Defenders of Wildlife.
5. Clarke, R. V. (1999). Hot Products: Understanding, Anticipating and Reducing Demand for Stolen Goods. Police Research Series, Paper 112. Policing and Reducing Crime Unit, Research Development and Statistics Directorate. London: Home Office.