Santiago, L. E. y Loomis, J. (2009) «The Relative Economic Value of Tropical Forest Rivers for Social Recreation and Nature-based Recreation: Implications for Estimating the Economic Benefits of New Hiking Trails»., Revista de Ciencias Sociales, 20, pp. 156–175. Disponible en: https://revistas.upr.edu/index.php/rcs/article/view/5722 (Accedido: 22 noviembre 2024).