C. M. Marques et al.,  "Segment comparison of nature-based tourists: Impacts on tourism in national parks", in Proc. of the Conf. on Corporate Governance, Innovation, Social and Environmental Responsibility (GIRA 2010), Conference on Corporate Governance, Innovation, Social and Environmental Responsibility, Ed., Lisboa, Conference on Corporate Governance, Innovation, Social and Environmental Responsibility, 2010, pp. 0-0