Ecosystem services, Economic value, Indirect use values, Soil conservation, Hydrological functions, Carbon sequestration, Water flow regulation.
 H. K. Gibbs and J. M. Salmon, "Mapping the world’s degraded lands," Applied Geography, vol. 57, pp. 12-21, 2015.Available at: Http://dx.doi.org/10.1016/j.apgeog.2014.11.024 .
 C. Sabogal, C. Besacier, and D. McGuire, "Forest and landscape restoration: Concepts, approaches and challenges for implementation," International Journal of forestry and Forest Industries, vol. 66, pp. 3-10, 2015.
\ L. Nahuelhual, P. Donoso, A. Lara, D. Nunez, C. Oyarzu, and E. Neira, "Valuing ecosystem services of Chilean temperate rainforests," Environment and Development Sustainability, vol. 9, pp. 481–499, 2007.Available at: http: dx.doi 10.1007/s10668-006-9033-8.
 R. S. De Groot, L. Brander, S. V. Ploeg, R. Costanza, F. Bernard, L. Braat, M. Christie, N. Crossman, A. Ghermandi, L. Hein, S. Hussain, P. Kumar, A. McVittie, R. Portela, L. C. Rodriguez, P. Brink, and P. Beukering, "Global estimates of the value of ecosystems and their services in monetary units," Ecosystem Services, vol. 1, pp. 50–61, 2014.Available at: https://doi.org/10.1016/j.ecoser.2012.07.005.
 J. K. Sang, "The Ogiek in Mau forest: Case study 3-Kenya, Forest Peoples Programme. England, UK. Retrieved from http://www.forestpeoples.org/sites/fpp/files/publication/2010/10/kenyaeng.pdf, " 2001.
 P. M. Kundu, "Application of remote sensing and GIS techniques to evaluate the impact of land use cover change on stream flows: The case of River Njoro in Eastern Mau- Kenya," PhD Thesis, Department of Natural Resource Egerton University, Kenya, 2007.
 P. Riera, G. Signorello, M. Thiene, P. A. Mahieu, S. Navrud, P. Kaval, and P. Elsasser, "Non-market valuation of forest goods and services: Good practice guidelines," Journal of Forest Economics, vol. 18, pp. 259–270, 2012.Available at: https://doi.org/10.1016/j.jfe.2012.07.001.
 E. Elias, D. Laband, M. Dougherty, G. Lockaby, P. Srivastava, and H. Rodrigues, "The water supply protection value of forests: A watershed-scale ecosystem services analysis based upon total organic carbon," Open Journal of Ecology, vol. 4, pp. 517-531, 2014.Available at: http:www.dx.doi.org/10.4236/oje.2014.49042 .
 J. Boyd and S. Banzhaf, "What are ecosystem services? The need for standardized environmental accounting units," Ecological Economics, vol. 63, pp. 616–626, 2007.Available at: https://doi.org/10.1016/j.ecolecon.2007.01.002.
 B. Fisher, R. K. Turner, and P. Morlin, "Defining and classifying ecosystem services for decision-making," Ecological Economics, vol. 68, pp. 643–653, 2009.Available at: https://doi.org/10.1016/j.ecolecon.2008.09.014.
 J. Xi, "Valuation of ecosystem services in Xishuangbanna Biodiversity conservation corridors initiative Pilot Site, China," presented at the Greater Mekong Sub-Region Core Environment Program-: ADB TA 6289, 2009.
 M. O. Okelo, J. O. Onyando, W. A. Shivoga, and S. N. Miller, "Analysis of surface runoff and soil loss under different land use types in River Njoro watershed using a mini-rainfall simulator. In: E.O. Odada, D.O. Olago, W. Ochola, M.Ntiba, S. Wandiga, N. Gichuki and H. Oyieke , Eds," in Proceedings of the 11th World Lakes Conference, Nairobi, Kenya, 2005.
 A. Kulecho and V. Muhandiki, "Water quality trends and inputs loads to Lake Nakuru. In: E.O.Odada, D.O. Olago, W. Ochola, M.Ntiba, S. Wandiga, N. Gichuki and H. Oyieke ,Eds," in Proceedings of the 11th World Lakes Conference, Nairobi, Kenya, 2005.
 J. M. Kinyanjui, P. Latva-Käyä, P. S. Bhuhneshwar, P. Kariuki, A. Gichu, and K. Wamichwe, "An inventory of the above ground biomass in the Mau forest Ecosystem, Kenya," Open Journal of Ecology, vol. 4, pp. 619-627, 2014.Available at: http://dx.doi/10.4236/oje.2014.410052
 J. M. Otuoma, "Analysis of forest types in relation to carbon offset potential: A case of Kakamega Rainforest, Kenya," PhD Dissertation, Dept. Biological Sciences, Jaramogi Oginga Odinga Univ. of Sci. and Tech., Bondo, Kenya, 2015.
.  K. Tanabe and F. Wagner, "Good practice guidance for land use, land-use change and forestry. Institute for Global Environmental Strategies, Hayama, Kanagawa, Japan. Available at: http://www.ipcc-nggip.iges. or. jp/public/gpglulucf/gpglulucf. htm," 2003.
 H. M. Cox, "A sustainability initiative to quantify carbon sequestration by campus trees," Journal of Geography, vol. 111, pp. 173-183, 2012.Available at: https://doi.org/10.1080/00221341.2011.628046.
 P. J. Ferraro, K. Lawlor, K. L. Mullan, and S. K. Pattanayak, "Forest figures: Ecosystem services valuation and policy evaluation in developing countries," Review of Environmental Economics and Policy, vol. 6, pp. 20-44, 2011.Available at: https://doi.org/10.1093/reep/rer019.