Costa, Sue Anne Regina Ferreira, et al. “Shark Teeth from Pirabas Formation (Lower Miocene), Northeastern Amazonia, Brazil”. Boletim Do Museu Paraense Emílio Goeldi - Ciências Naturais, vol. 4, no. 3, Dec. 2009, pp. 221-30, https://doi.org/10.46357/bcnaturais.v4i3.650.