Baptista, Elisabeth Mary de Carvalho, Brenda Rafaele Viana da Silva, and Liége de Souza Moura. “Sandstone Reefs on the Coast of Piauí As Geotouristic Attractions”. Physis Terrae - Ibero-Afro-American Journal of Physical Geography and Environment 5, no. 2-3 (December 31, 2023): 201–217. Accessed May 19, 2024. https://revistas.uminho.pt/index.php/physisterrae/article/view/5567.