1. Baez, A. (2002) Sky Walk-Sky Trek: a Costa Rica community project Mountain Research and Development, 22(2), pp. 128 - 31.
2. Barbier, E.(1989) Economics, Natural-Resource Scarcity and Development. London : Earthscan.
3. Buchsbaum, B.(2004). Ecotourism and sustainable development in Costa Rica. major paper submitted to Virginia Polytechnic Institute and State University. . In [ pp. ] . . Available at: http://scholar.lib.vt.edu/theses/available/etd-05052004-171907/unrestricted/EcotourismCostRica.pdf (accessed 20 July 2006)
4. Caragata, W. (1995) Branching out: science meets tourism in the Costa Rican rainforest Macleans, 108(20), pp. 58 - 9.
5. Ceballos-Lascuráin, H. (1991) Tourism, ecotourism and protected areas Parks, 2(3), pp. 31 - 5.