Archibald, J.D. 1982. A study of Mammalia and geology across the Cretaceous-Tertiary boundary in Garfield County, Montana. University of California Publications in Geological Sciences, 122:1-286.

Case, J.A., Goin, F.J., and Woodburne, M.O. 2005. "South American" marsupials from the Late Cretaceous of North America and the origin of marsupial cohorts. Journal of Mammalian Evolution, 11:223-255.

Cifelli, R.L., Madsen, S.K., and Larson, E.M. 1996. Screenwashing and associated techniques for the recovery of microvertebrate fossils. Oklahoma Geological Survey Special Publication 96-4:1-24.

Clemens, W.A. 1979. Marsupialia, p. 192-220. In Lillegraven, J.A., Kielan-Jaworowska, Z., and Clemens, W.A. (eds.), Mesozoic Mammals, the First Two-thirds of Mammalian History. University of California Press, Berkeley, California.

Clemens, W.A. 2006. Early Paleocene (Puercan) peradectid marsuials from northeastern Montana, North American Western Interior. Palaeontographica Abteilung A, 27:19-31.

Clemens, W.A., Jr. 1966. Fossil mammals of the type Lance Formation, Wyoming; Part II, Marsupialia. University of California Publications in Geological Sciences, 62:1-122.

Crochet, J.Y. 1979. Diversite systematique des Didelphidae (Marsupialia) Europeens Tertiares. Géobios, 12:365-378.

Crochet, J.Y. 1980. Les Masupiaux du tertiare d'Europe. Éditions de la Fondation Singer-Polignac, Paris, France.

Davis, B.M. 2007. A revision of "pediomyid" marsupials from the Late Cretaceous of North America. Acta Palaeontologica Polonica, 52:217-256.

Eaton, J.G. 2006. Late Cretaceous mammals from Cedar Canyon, southwestern Utah. New Mexico Museum of Natural History and Science Bulletin, 35:373-402.

Eaton, J.G., Diem, S., Archibald, J.D., Schierup, C., and Munk, H. 1999. Vertebrate paleontology of the Upper Cretaceous rocks of the Markagunt Plateau, southwestern Utah, p. 323-333. In Gillette, D.D. (ed.), Vertebrate Paleontology in Utah. Utah Geological Survey, Salt Lake City, Utah.

Gazin, C.L. 1956. Paleocene mammalian faunas of the Bison Basin in South-Central Wyoming. Smithsonian Miscellaneous Collections, 131:1-57.

Heller, F. 1936. Neue Beuteltierreste aus der mitteleözanen Braunkohle des Geiseltales bei Halle (Saale). Nova Acta Leopoldina, 4:311-316.

Hooker, J.J., Sanchez-Villagra, M.R., Goin, F.J., Simons, E.L., Attia, Y., and Seiffert, E.R. 2008. The origin of Afro-Arabian 'didelphimorph' marsupials. Palaeontology, 51:635-648.

Horovitz, I., Ladeveze, S., Argot, C., Macrini, T.E., Martin, J.E., Hooker, J.J., Kurz, de Muizon, C., and Sánchez-Villagra, M.R. 2008. The anatomy of Herpetotherium cf. fugax Cope, 1873, a metatherian from the Oligocene of North America. Palaeontographica (A), 284:109-141.

Horovitz, I., Martin, T., Bloch, J.I., Ladevčze, S., Kurz, C., and Sánchez-Villagra, M.R. 2009. Cranial Anatomy of the earliest Marsupials and the origin of opossums. PLoS ONE, 4:e8278.

Johanson, Z. 1996a. New marsupial from the Fort Union Formation, Swain Quarry, Wyoming. Journal of Paleontology, 70:1023-1031.

Johanson, Z. 1996b. Revision of the Late Cretaceous North American marsupial genus Alphadon. Palaeontographica Abteilung A, 242:127-184.

Korth, W.W. 2007. Marsupialia, p. 39-47. In Janis, C.M., Gunnell, G.F., and Uhen, M.D. (eds.), Evolution of Tertiary Mammals of North America, Vol. 2. Cambridge University Press, Cambridge, UK.

Krishtalka, L. and Stucky, R.K. 1983. Paleocene and Eocene marsupials of North America. Annals of Carnegie Museum, 52:229-263.

Kuiper, K.F., Deino, A., Hilgen, F.J., Krijgsman, W., Renne, P.R., and Wijbrans, J.R. 2008. Synchronizing rock clocks of Earth history. Science, 320:500-504.

Lillegraven, J.A. 1969. Latest Cretaceous mammals of the upper part of Edmonton Formation of Alberta, Canada, and review of Marsupial-Placental dichotomy in mammalian evolution. The University of Kansas Paleontological Contributions, 12:1-122.

Lofgren, D.L., Lillegraven, J.A., Clemens, W.A., Gingerich, P.D., and Williamson, T.E. 2004. Paleocene biochronology; the Puercan through Clarkforkian land mammal ages, p. 43-105. In Woodburne, M.O. (ed.), Late Cretaceous and Cenozoic mammals of North America. Columbia University Press, New York., New York.

Martin, J.E., Case, J.A., Jagt, J.W.M., Schulp, A.S., and Mulder, E.W.A. 2005. A new european marsupial indicates a Late Cretaceous high-latitude transatlantic dispersal route. Journal of Mammalian Evolution, 12:495-511.

Matthew, W.D., and Granger, W. 1921. New genera of Paleocene mammals. American Museum Novitates, 13:1-13.

Rose, K.D. 1981. The Clarkforkian Land-Mammal Age and mammalian faunal composition across the Paleocene-Eocene boundary. University of Michigan Papers on Paleontology, 26:1-197.

Rothecker, J., and Storer, J.E. 1996. The Marsupials of the Lac Pelletier Lower Fauna, Middle Eocene (Duchesnean) of Saskatchewan. Journal of Vertebrate Paleontology, 16:770-774.

Sánchez-Villagra, M., Ladeveze, S., Horovitz, I., Macrini, T.E., Martin, J.E., Morre-Fay, S., De Muizon, C., Schmeizle, T., and Asher, R.J. 2007. Exceptionally preserved North American Paleogene metatherians: Adaptations and discovery of a major gap in the opossum fossil record. Biological Letters, 3:318-322.

Standhardt, B.R. 1980. Early Paleocene mammals of the Black Toe Local Fauna, Nacimiento Formation, New Mexico, Unpublished M.S. Thesis, The University of Arizona, Tucson, Arizona, USA.

Stock, C. 1936. Sespe Eocene didelphids. Proceedings of the National Academy of Sciences, 22:122-124.

Taylor, L.H. 1984. Review of Torrejonian mammals from the San Juan Basin, New Mexico. Unpublished Ph.D. Thesis, The University of Arizona, Arizona, USA.Tucson.

Tomida, Y. and Butler, R.F. 1980. Dragonian mammals and Paleocene magnetic polarity stratigraphy, North Horn Formation, central Utah. American Journal of Science, 280:787-811.

Trouessart, E. –L. 1879. Catalogue des mammifčres vivants et fossiles. Revue et Magasin de Zoologie, 7:219-285.

Williamson, T.E. 1993. The beginning of the age of mammals in the San Juan Basin; biostratigraphy and evolution of Paleocene mammals of the Nacimiento Formation. Unpublished Ph.D. Thesis, University of New Mexico, Albuquerque, New Mexico, USA.

Williamson, T.E. 1996. The beginning of the age of mammals in the San Juan Basin, New Mexico; biostratigraphy and evolution of Paleocene mammals of the Nacimiento Formation. New Mexico Museum of Natural History and Science Bulletin, 8:1-141.

Williamson, T.E., Hester, P.M., and Bednarski, S.P. 2006. Transfer of UALP San Juan Basin vertebrate collection to the NMMNH. New Mexico Geology, 28:62-63.

Williamson, T.E. and Lucas, S.G. 1992. Stratigraphy and mammalian biostratigraphy of the Paleocene Nacimiento Formation, southern San Juan Basin, New Mexico. New Mexico Museum of Natural History and Science Bulletin, 43:265-296.