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Akersten, W. A.; McDonald, H. G. (June 1991). «Nothrotheriops from the Pleistocene of Oklahoma and Paleogeography of the Genus». The Southwestern Naturalist. 36 (2): 178–185. JSTOR3671918. doi:10.2307/3671918Verifique data em: |data= (ajuda)
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Muizon, C. de; McDonald, H. G.; Salas, R.; Urbina, M. (June 2004). «The Youngest Species of the Aquatic Sloth Thalassocnus and a Reassessment of the Relationships of the Nothrothere Sloths (Mammalia: Xenarthra)». Society of Vertebrate Paleontology. Journal of Vertebrate Paleontology. 24 (2): 387–397. Bibcode:2004JVPal..24..387D. doi:10.1671/2429aVerifique data em: |data= (ajuda)
Akersten, W. A.; McDonald, H. G. (June 1991). «Nothrotheriops from the Pleistocene of Oklahoma and Paleogeography of the Genus». The Southwestern Naturalist. 36 (2): 178–185. JSTOR3671918. doi:10.2307/3671918Verifique data em: |data= (ajuda)
