Martínez, Sergio, and Rich Moor. “Extinct and Extant Sand Dollars (Clypeasteroida: Echinoidea) from Uruguay”. Revista de Biología Tropical 53, no. S3 (December 1, 2005): 1–7. Accessed November 23, 2024. https://revistas.ucr.ac.cr/index.php/rbt/article/view/26662.