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Cifelli, R. L. 1993. The phylogeny of the native South American ungulates. In Mammal Phylogeny. Volume 2: Placentals. pp. 195-216, Szalay, F. S., Novacek, M. J. and McKenna, M. C. ed. Springer-Verlag, New York.
Gabbert, S. L. 1997. The auditory and posterior cranial anatomy of the Toxodontia (Order Notoungulata) and its implications for higher level relationships. Ph.D. dissertation. Columbia University.
Macrini, T. E. 2006. The Evolution of Endocranial Space in Mammals and Non-mammalian Cynodonts. Ph.D. dissertation. University of Texas at Austin.
Billet, G. B. 2010. New observations on the skull of Pyrotherium (Pyrotheria, Mammalia) and new phylogenetic hypotheses on South American ungulates. Journal of Mammalian Evolution. Vol. 17(1), pp. 21-59.
Billet, G. B. 2011. Phylogeny of the Notoungulata (Mammalia) based on cranial and dental characters. Journal of Systematic Palaeontology. Vol. 9(4), pp. 481-497.
Luo, Z.-X. and Eastman, E. R. 1995. Petrosal and inner ear of a squalodontoid whale: implications for evolution of hearing in odontocetes. Journal of Vertebrate Paleontology. Vol. 15, pp. 431-442.
Meng, J. and Fox, R. C. 1995. Osseous inner ear structures and hearing in early marsupials and placentals. Zoological Journal of the Linnean Society. Vol. 115, pp. 47-71.
Luo, Z.-X. and Marsh, K. 1996. Petrosal (periotic) and inner ear of a Pliocene kogiine whale (Kogiinae, Odontoceti): implications on relationships and hearing evolution of toothed whales. Journal of Vertebrate Paleontology. Vol. 16, pp. 328-348.
Geisler, J. H. and Luo, Z.-X. 1996. The petrosal and inner ear of Herpetocetus sp. (Mammalia: Cetacea) and their implications for the phylogeny and hearing of archaic mysticetes. Journal of Vertebrate Paleontology. Vol. 70, pp. 1045-1066.
Geisler, J. H. and Uhen, M. D. 2003. Morphological support for a close relationship between hippos and whales. Journal of Vertebrate Paleontology. Vol. 23, pp. 991-996.
Sánchez-Villagra, M. R. and Schmelzle, T. 2007. Anatomy and development of the bony inner ear in the woolly opossum, Caluromys philander (Didelphimorphia, Marsupialia). MastozoologÃa Neotropical. Vol. 14, pp. 53-60.
Billet, G. and de Muizon, C. 2013. External and internal anatomy of a petrosal from the Late Paleocene of Itaborai, Brazil, referred to Notoungulata (Placentalia). Journal of Vertebrate Paleontology. Vol. 33(2), pp. 455-469.
Agnolin, F. L. and Chimento, N. R. 2021. Afrotherian affinities for endemic South American “ungulates”. Mammalian Biology. Vol. 76(2), pp. 101-108.
Rougier, G. W., Wible, J. R. and Novacek, M. J. 1998. Implications of Deltatheridium specimens for early marsupial history. Nature. Vol. 396, pp. 459-463.
Schmelzle, T., Sánchez-Villagra, M. R. and Maier, W. 2007. Vestibular labyrinth diversity in diprotodontian marsupial mammals. Mammal Study. Vol. 32, pp. 83-97.
Macrini, T. E., Rougier, G. W. and Rowe, T. 2007. Description of a cranial endocast from the fossil mammal Vincelestes neuquenianus (Theriiformes) and its relevance to the evolution of endocranial characters in therians. Anatomical Record. Vol. 290, pp. 875-892.
Wible, J. R., Rougier, G. W., Novacek, M. J. and Asher, R. J. 2007. Cretaceous eutherians and Laurasian origin for placental mammals near the K/T boundary. Nature. Vol. 447, pp. 1003-1006.
Bloch, J. I., Silcox, M. T., Boyer, D. M. and Sargis, E. J. 2007. New Paleocene skeletons and the relationship of plesiadapiforms to crown-clade primates. Proceedings of the National Academy of Sciences. Vol. 104, pp. 1159-1164.