Balderrama, S. “Carbon Sequestration in Coniferous Forest in the Sierra Tarahumara in Chihuahua, Mexico”. Revista Latinoamericana De Recursos Naturales, Vol. 4, no. 2, July 2008, pp. 203 -214, https://revista.itson.edu.mx/index.php/rlrn/article/view/126.