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Murphy et al. 2001 Murphy, W.J.; Eizirik, E.; O'Brien, S.J.; Madsen, O.; Scally, M.; Douady, C.J.; Teeling, E.C.; Ryder, O.A.; Stanhope, M.J.; de Jong, W.W.; Springer, M.S. (2001). "Resolution of the early placental mammal radiation using Bayesian phylogenetics". Science. 294 (5550): 2348-2351. Bibcode:2001Sci...294.2348M. doi:10.1126/science.1067179. PMID11743200.
Thewissen 1990 Thewissen, J.G.M. (1990). Evolution of Paleocene and Eocene Phenacodontidae (Mammalia, Condylarthra). Papers on Paleontology. 29. Museum of Paleontology, The University of Michigan. hdl:2027.42/48629. OCLC742731818.