1. United Nations Environmental Programme (2009) changing trends in forest products trade. In: Vital forest graphics. UNEP Job No. DEW/1032/NA, pp 26–30
2. United States Department of Agriculture (2007) Valuing ecosystem services: capturing the true value of nature’s capital. Washington, DC, FS-870a
3. Louman B, Fischlin A, Gluck P, Innes J, Lucier A, Parrotta J, Santoso H, Thompson I, Wreford A (2009) Forest ecosystem services: a cornerstone for human well-being. IUFRO World Ser 22:15–27
4. Dudley N, Stolton S (2003) Running pure: the importance of forest protected areas to drinking water. World Bank/World Wildlife Fung Alliance for Forest Conservation and Sustainable Use, Washington, DC
5. Stein S, Hatfield M, McRoberts R, Meneguzzo D, Coma S (2010) Threats to private forest lands in the U.S.A.: a forests on the edge study. In: Pye JM, Michael RH, Yasmeen S, Lee DC, Beatty JS (Tech eds) Advances in threat assessment and their application to forest and rangeland management—vol 1. Gen. Tech. Rep. PNWGTR802. U.S. Department of Agriculture, Forest Service, Pacific Northwest and Southern Research Stations, Portland, OR, 246 p