Varela, L.; Tambusso, P. S.; McDonald, H. G.; Fariña, R. A. (2018). «Phylogeny, Macroevolutionary Trends and Historical Biogeography of Sloths: Insights From a Bayesian Morphological Clock Analysis». Systematic Biology. 68 (2): 204-218. doi:10.1093/sysbio/syy058
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ncbi.nlm.nih.gov
Varela, L.; Tambusso, P.S.; McDonald, H.G.; Fariña, R.A.; Fieldman, M. (2019). «Phylogeny, Macroevolutionary Trends and Historical Biogeography of Sloths: Insights From a Bayesian Morphological Clock Analysis». Systematic Biology. 68 (2): 204–218. PMID30239971. doi:10.1093/sysbio/syy058