Monroe, M. J.; Bokma, F. (2010). «Little evidence for Cope's rule from Bayesian phylogenetic analysis of extant mammals». Journal of Evolutionary Biology. 23 (9): 2017–2021. PMID20629852. doi:10.1111/j.1420-9101.2010.02051.x
Kingsolver, J. G.; Pfennig, D. W. (julho de 2004). «Individual-level selection as a cause of Cope's rule of phyletic size increase». Evolution. 58 (7): 1608–1612. PMID15341162. doi:10.1554/04-003
Monroe, M. J.; Bokma, F. (2010). «Little evidence for Cope's rule from Bayesian phylogenetic analysis of extant mammals». Journal of Evolutionary Biology. 23 (9): 2017–2021. PMID20629852. doi:10.1111/j.1420-9101.2010.02051.x
Kingsolver, J. G.; Pfennig, D. W. (julho de 2004). «Individual-level selection as a cause of Cope's rule of phyletic size increase». Evolution. 58 (7): 1608–1612. PMID15341162. doi:10.1554/04-003