SANTIAGO, L. E.; LOOMIS, J. 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, [S. l.], v. 20, p. 156–175, 2009. Disponível em: https://revistas.upr.edu/index.php/rcs/article/view/5722. Acesso em: 1 jun. 2023.