Picasso, Mariana B. J., et al. “A Juvenile of Pterocnemia Pennata (Aves, Rheidae) from the Pleistocene of the Pampean Region: Ontogenetic and Environmental Implications”. Revista Mexicana De Ciencias Geológicas, vol. 28, no. 1, Jan. 2018, pp. 192-00, https://rmcg.unam.mx/index.php/rmcg/article/view/620.