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O'Leary, M. A.; Bloch, J. I.; Flynn, J. J.; Gaudin, T. J.; Giallombardo, A.; Giannini, N. P.; Cirranello, A. L. (2013). "The placental mammal ancestor and the post–K-Pg radiation of placentals". Science339 (6120): 662–667. PMID23393258. doi:10.1126/science.1229237.
Asher, RJ; Bennett, N; Lehmann, T (2009). "The new framework for understanding placental mammal evolution". BioEssays31 (8): 853–864. PMID19582725. doi:10.1002/bies.200900053.
O'Leary, M. A.; Bloch, J. I.; Flynn, J. J.; Gaudin, T. J.; Giallombardo, A.; Giannini, N. P.; Cirranello, A. L. (2013). "The placental mammal ancestor and the post–K-Pg radiation of placentals". Science339 (6120): 662–667. PMID23393258. doi:10.1126/science.1229237.