Harrington, Horacio J., and Armando F. Leanza. “The Classification of the "Olenidae" And the "Ceratopygidae" (Trilobita)”. Revista de la Asociación Geológica Argentina 7, no. 3 (July 1, 1952): 190-206. Accessed December 10, 2024. https://revista.geologica.org.ar/raga/article/view/974.