“Revision of the Brachiopod Eoorthis Grandis Harrington, 1938, from the Lower Ordovician of Northwestern Argentina”. Ameghiniana 41, no. 1 (March 8, 2013): 119–123. Accessed September 16, 2025. https://ameghiniana.org.ar/index.php/ameghiniana/article/view/809.