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Boffy, ACM., RLM Novaes, GS Mello and C. Sant'Anna, C. 2010. Registro da preguiça-de-coleira Bradypus torquatus (Pilosa, Bradypodidae) em três localidades do Estado do Rio de Janeiro: Nova Friburgo, Cachoeiras de Macacu e Teresópolis. Edentata 11(1): 78-80.

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–––– 2008. Nuevos materiales de Ortotheriinae (Xenarthra, Tardigrada, Megalonychidae) procedentes del "Mesopotamiense" (Mioceno tardío) de Entre Ríos. INSUEGO, miscelánea 17: 11-20.

–––– 2010. On the systematics of Ortotherium Ameghino (Xenarthra, Tardigrada, Megalonychidae) from the 'Congomerado osífero' (late Miocene) of Argentina. Journal of Vertebrate Paleontology 30(3): 975-980.

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––––, AA Carlini, F Pujos and GJ Scillato-Yané. 2004. The pes of Pyramiodontherium bergi (Moreno & Mercerat, 1891) (Mammalia, Xenarthra, Phyllophaga): the most complete pes of a Tertiary Megatheriinae. Geodiversitas 26(4): 643-659.

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Britton, SW. 1941a. Form and function in the sloth. The Quarterly Review of Biology 16: 13-34..

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Britton, SW and WE Atkinson. 1938. Poikilothermism in the sloth. Journal of Mammalogy 19: 94-99.

–––– , RF Kline and H Silvette. 1938. Blood-chemical and other conditions in normal and adrenalectomized sloths. American Journal of Physiology 123: 701-704.

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Bullock, TH. 1983. Neuroethological role of dynamic traits of excitable cells: a proposal for the physiological basis of slothfulness in the sloth. Neurology and Neurobiology 5: 587-595.

Burmeister, KH. 1864-69. ??. Anales del Museo Publico de Buenos Aires 1: 149-182.

–––– 1865. Hautpanzer bei Mylodon. Archive für Anatomie, Physiologie und wissenschaftliche Medicin 1865: 317-334.

–––– 1866. Fauna argentina: Primera parte, Mamiferos fósiles. Anales del Museo Publico de Buenos Aries I: 87-300, plates V-XIV.

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–––– 1882. Nothropus priscus, ein bisher unbekanntes fossiles, Faulthier. Sitzungsberichte der Königlich Preussischen Akademie der Wissenschaffen zu Berlin 28: 613-620. (type description, Nothropus & N. priscus)

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–––– 1889. Descripción de algunas nuevas adquisiciones del Museo Nacional, 1, Megatherium americanum. Los caballos fósiles de la Pampa Argentina, Suplemento: 27-32.