Oliveira, M. R., J. Gonçalves, C. Costa, L. D. Leite, e K. Erzini. Implementation of Eco-Tourist Underwater Routs in the Algarve (south of Portugal) As a Way of Preserving Exuberant Marine Ecosystems. Revista Turismo & Desenvolvimento, Vol. 3, n. 13/14, Jan. 2010, pp. 1161-2, doi:10.34624/rtd.v3i13/14.13303.