Welker, F.; Collins, M. J.; Thomas, J. A.; Wadsley, M.; Brace, S.; Cappellini, E.; Turvey, S. T.; Reguero, M.; Gelfo, J. N.; Kramarz, A.; Burger, J.; Thomas-Oates, J.; Ashford, D. A.; Ashton, P. D.; Rowsell, K.; Porter, D. M.; Kessler, B.; Fischer, R.; Baessmann, C.; Kaspar, S.; Olsen, J. V.; Kiley, P.; Elliott, J. A.; Kelstrup, C. D.; Mullin, V.; Hofreiter, M.; Willerslev, E.; Hublin, J.-J.; Orlando, L.; Barnes, I.; MacPhee, R. D. E. (18 de marzo de 2015). «Ancient proteins resolve the evolutionary history of Darwin’s South American ungulates». Nature. ISSN0028-0836. doi:10.1038/nature14249.
Shockey, Bruce J.; Flynn, John J. (2007/12). «Morphological Diversity in the Postcranial Skeleton of Casamayoran (?Middle to Late Eocene) Notoungulata and Foot Posture in Notoungulates». American Museum Novitates2007 (3601): 1-26. ISSN0003-0082. doi:10.1206/0003-0082(2007)3601[1:MDITPS]2.0.CO;2.|fechaacceso= requiere |url= (ayuda)
E. Lundelius, et al. 2013. The first occurrence of a toxodont (Mammalia, Notoungulata) in the United States. Journal of Vertebrate Paleontology, Vol 33, No 1, pp. 229–232 DOI:10.1080/02724634.2012.711405
Shockey, B.J.; Flynn (2007). «Morphological diversity in the postcranial skeleton of Casamayoran (? Middle to Late Eocene) Notoungulata and foot posture in notoungulates». American Museun Novitates3601: 1-26. doi:10.1206/0003-0082(2007)3601[1:MDITPS]2.0.CO;2.
issn.org
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Welker, F.; Collins, M. J.; Thomas, J. A.; Wadsley, M.; Brace, S.; Cappellini, E.; Turvey, S. T.; Reguero, M.; Gelfo, J. N.; Kramarz, A.; Burger, J.; Thomas-Oates, J.; Ashford, D. A.; Ashton, P. D.; Rowsell, K.; Porter, D. M.; Kessler, B.; Fischer, R.; Baessmann, C.; Kaspar, S.; Olsen, J. V.; Kiley, P.; Elliott, J. A.; Kelstrup, C. D.; Mullin, V.; Hofreiter, M.; Willerslev, E.; Hublin, J.-J.; Orlando, L.; Barnes, I.; MacPhee, R. D. E. (18 de marzo de 2015). «Ancient proteins resolve the evolutionary history of Darwin’s South American ungulates». Nature. ISSN0028-0836. doi:10.1038/nature14249.
Shockey, Bruce J.; Flynn, John J. (2007/12). «Morphological Diversity in the Postcranial Skeleton of Casamayoran (?Middle to Late Eocene) Notoungulata and Foot Posture in Notoungulates». American Museum Novitates2007 (3601): 1-26. ISSN0003-0082. doi:10.1206/0003-0082(2007)3601[1:MDITPS]2.0.CO;2.|fechaacceso= requiere |url= (ayuda)
Scott, William Berryman. Litopterna of the Santa Cruz beds. Sinclair, William John. Typotheria of the Santa Cruz beds. Scott, William Berryman. Nature and origin of the Santa Cruz fauna. (1910-1932). Palaeontology IV : mammalia of the Santa Cruz beds.. The University. OCLC602568016. Consultado el 27 de agosto de 2020.