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von Hagen, VW. 1940. Slowfoot the sloth, a prehistoric throwback, views his upside-down world. Frontiers, Philadelphia 4: 66-71.

Hall, ER and KR Kelson. 1952. The subspecific status of two Central American sloths. University of Kansas Publications, Museum of Natural History 5(24): 313-317.

Hansen, RM. 1978. Shasta ground sloth food habits, Rampart Cave, Arizona. Paleobiology 4(3): 302-319.

Hamrick, MW, EL Simons and WL Jungers. 2000. New wrist bones of the Malagasy giant subfossil lemurs. Journal of Human Evolution 38: 635-650.

Hammond, EE, D Sosa, R Beckerman and RF Aguilar. 2009. Respiratory disease associated with Bordetella bronchiseptica in a Hoffmann's two-toed sloth (Choloepus hoffmanni). Journal of Zoo and Wildlife Medicine 40(2): 369-372.

Harlan, R. 1842. Description of the bones of a fossil animal of the extinct order Edentata (Oryctotherium missouriense). Proceedings of the American Philosophical Society: 109-111.

––– 1843. Remarks on Mr. Owen's letter to the editors on Dr. Harlan's new fossil Mammalia. American Journal of Science 45(1): 208-211.

Harkness, HW. 1882. Footprints found at the Carson State Prison. Proceedings of the California Academy of Science ???.

Haupt, RJ, LRG DeSantis, JL Green and P Unger. 2013. Dental microwear texture as a proxy for diet in xenarthras. Journal of Mammalogy 94(4): 586-866.

Hausman, LA. 1936. Further studies of the hair of the fossil ground sloth (Nothrotherium shastense) and of its problematical "ovate bodies." American Journal of Science 31: 223-228.

Hauthal, R. 1899. El Mamifero misterioso de la Patagonia, "Grypotherium domesticum." I. Resena de los hallazgos en las Cavernas de Ultima Esperanza. Revista del Museo de La Plata 9: 411-420.

Hay, OP. 1916. Description of two extinct Mammals of the order Xenarthra from the Pleistocene of Texas. Proceedings of the United States National Museum 51: 107-123.

––– 1919. Descriptions of some mammalian and fish remains from Florida of probably Pleistocene age. Proceedings of the United States National Museum 56: 103-112. (type description, Thinobadistes segnis)

––– 1921. Descriptions of species of Pleistocene Vertebrates, types or specimens of most of which are preserved in the United States National Museum. Proceedings of the United States National Museum 59: 599-642.

Herbig-Sandreuther, A. 1964. Neue Beobachtungen am venezolanischen Dreizehenfaultier, Bradypus infuscatus flaccidus, Gray (1849). Acta Tropica 21: 97-113.

Hernandez, G. 1992. Bioquimica de algunos desdentados extinguidos de Cuba. Archaeofauna 1: 105-108.

Herrer, A and HA Christensen. 1980. Leishmania brasiliensis in the Panamanian two-toed sloth, Choloepus hoffmanni. American Journal of Tropical Medicine and Hygiene 29(6): 1196-1200.

Heuser, CH and GB Wislocki. 1935. Early development of the sloth (Bradypus griseus) and its similarity to that of man. Contributions to Embryology, Carnegie Institution Publication 144(25): 1-13.

Hill, CA and DD Gillette. 1987. A uranium series date for the Shasta ground sloth, Nothrotheriops shastensis, from Carlsbad Cavern, New Mexico. Journal of Mammalogy 68(3): 718-719.

Hill, RV. 2006. Comparative anatomy and histology of xenarthran osteoderms. Journal of Morphology 267(12): 1441-1460.

Hilton, RP, DC Dailey and HG McDonald. 2000. A late Pleistocene biota from the ARCO Arena site, Sacramento, California. PaleoBios 20(1): 7-12.

Hirschfeld, SE. 1971. Ground sloths and anteaters (Edentata, Mammalia) from the Tertiary of Colombia, South America. Ph.D. dissertation, University of California at Berkeley. Berkeley, California, ?pp.

––– 1981. Pliometanastes protistus (Edentata, Megalonychidae) from Knight's Ferry, California, with discussion of early Hemphillian megalonychids. PaleoBios 36: 1-16. (revised type description, Pliometanastes protistus)

––– 1985. Ground sloths from the Friasian La Venta fauna, with additions to the Pre-Friasian Coyaima fauna of Colombia, South America. University of California Publications in Geological Science 128: 1-91. (type description, Pseudoprepotherium confusum)

Hirschfeld, SE and SD Webb. 1968. Plio-Pleistocene megalonychid sloths of North America. Bulletin of the Florida State Museum Biological Sciences 12(5): 213-296. (type description, Megalonyx mathisi & Pliometanstes protistus)

Hoffman, EA and EL Ritman. 1985. Effect of body orientation on regional lung expansion in dog and sloth. Journal of Applied Physiology 59: 481-491.

Hoffstetter, R. 1949a. Nuevas observaciones sobre los Edentata del Pleistoceno superior de la sierra ecuatoriana. I. Oreomylodon, subgénero nuevo para designar Glossotherium wegneri. Boletin de Informaciones Cientificas Nacionales (Quito) 3: 19-42. (type description: Oreomylodon, O. wegneri)

––– 1949b. Nuevas observaciones sobre los Edentata del pleistoceno superior de la sierra ecuatoriana. II.??  Boletin de Informaciones Cientificas Nacionales (Quito) 3(20-21): 67-99.

––– 1949c. Sobre los Megatheriidae del Pleistoceno del Ecuador. Schaubiagen. nov. Boletín de Informaciones Científicas Nacionales 3(25), suplemento: 1-45.

––– 1952. Les mammifères plèistocenes de la République de L'Équateur. Mémoires de la Société Géologique de France, Nouvelle Série 31: 391pp.

––– 1954. Phylogenie des Édentés Xenarthres. Bulletin du Museum National del Histoire Naturelle 26(3): 433-438.

––– 1955. Charactères ancestraux et phylogénie des Edentés xénarthres. Colloques Internationaux du Centre National de la Réchérche Scientifique. Problèmes Actuels de Paléontologie 15: 87-99.

––– 1956. Contribution á l'étude des Orophodontoidea gravigrades cuirassés de la Patagonie. Annales Paléontologie 42: 25-64.

––– 1958. Édentés Xenarthres. In P Piveteau (Ed.), Traité de Paléontologie, Vol. 6. Masson et Companie, Paris. pp. 536-636.

––– 1961. Description d'un squelette de Planops (gravigrade du Miocene de Patagonia). Mammalia 25(1): 57-96. (type description, Pseudoprepotherium)

––– 1968. Un gisement de mammiferes Déséadiens (Oligocene inférieur) en Bolivie. Comptes Rendus de l'Académie des Sciences 267(13): 1095-1097.

––– 1969. Remarques sur la phylogénie et la classification des Édentés Xenarthres (Mammaiferes) actuels et fossiles. Bulletin du Museum National del Histoire Naturelle 41(1): 91-103.

––– 1982. Les Édentés Xénarthres, un groupe singulier de la faune néotropicale. Paleontology, Essential of Historical Geology (Proceedings of the First International Meeting of Paleontology, Venice 1981): 385-443.

Hoffstetter, R, C Martinez, M Mattauer and P Tomasi. 1971. Lacayani, un nouveau gisement bolivien de mammifères déséadiens (Oligocène inférieur). Comptes Rendus de l'Académie des Sciences 273: 2215-2218.

Hofreiter, M, HN Poinar, WG Spaulding, K Bauer, PS Martin, G Possnert and S Pääbo. 2000. A molecular analysis of ground sloth diet through the last glaciation. Molecular Ecology 9(12): 1975-1984.

–––, JL Betancourt, AP Sbriller, V Markgraf and HG McDonald. 2003. Phylogeny, diet, and habitat of an extinct ground sloth from Cuchillo Curá, Neuquén Province, southwest Argentina. Quaternary Research 59: 364-378.

Hoke, J. 1987. Oh, it's so nice to have a sloth around the house. Smithsonian Magazine April: 88-89.

Holman, JA, and CJ Clausen. 1984. Fossil vertebrates associated with Paleo-Indian artifact at Little Salt Spring, Florida. Journal of Vertebrate Paleontology 4(1): 146-154.

Horwath, ST and JF Toole. 1973. Some observations on the circadian rhythm of Choloepus hoffmanni, the two-toed sloth. Laboratory Animal Science 23(3): 377-379.

Hoss, M, A Dilling, A Currant and S Pääbo. 1996. Molecular phylogeny of the extinct ground sloth Mylodon darwinii. Proceedings of the National Academy of Sciences, USA 93: 181-185.

Humphry, GM. 1870. The myology of the limbs of the unau, the ai, the two-toed ant-eater and the pangolin. Journal of Anatomy and Physiology 4: 17-78.

Hyrtl, J. ?? Beiträge zur vergleichenden angiologie. Part V. Das arterielle Gefäss-system der edentaten. Denkschriften der Kaiserlichen Akademie der Wissenschaften. Mathematisch-Naturwissenschaftliche Classe 6: 21-64.