von Engelhardt, W; Wolter, S; Lawrenz, H; Hemsley, J.A. (1978). „Production of methane in two non-ruminant herbivores”. Comparative Biochemistry and Physiology A. 60 (3): 309—11. doi:10.1016/0300-9629(78)90254-2.
Björnhag, G.; Becker, G.; Buchholz, C.; W. von Engelhardt, W. (1994). „The gastrointestinal tract of the rock hyrax (Procavia habessinica). 1. Morphology and motility patterns of the tract”. Comparative Biochemistry and Physiology A. 109 (3): 649—53. PMID8529006. doi:10.1016/0300-9629(94)90205-4.
Eugenie Barrow; Erik R. Seiffert; Elwyn L. Simons (2010). „A primitive hyracoid (Mammalia, Paenungulata) from the early Priabonian (Late Eocene) of Egypt”. Journal of Systematic Palaeontology. 8 (2): 213—244. S2CID84398730. doi:10.1080/14772010903450407.
Asher, R.J.; Novacek, M.J.; Geisher, J.H. (2003). „Relationships of endemic African mammals and their fossil relatives based on morphological and molecular evidence”. Journal of Mammalian Evolution. 10: 131—194. S2CID39296485. doi:10.1023/A:1025504124129.
Tabuce, R.; Seiffert, E. R.; Gheerbrant, E.; Alloing-Séguier, L.; von Koenigswald, W. (2017). „Tooth Enamel Microstructure of Living and Extinct Hyracoids Reveals Unique Enamel Types Among Mammals”. Journal of Mammalian Evolution. 24 (1): 91—110. doi:10.1007/s10914-015-9317-6.
„Eastern Tree Hyrax”. IUCN red list. International Union for Conservation of Nature and Natural Resources. 3. 2. 2014. Приступљено 17. 12. 2018.CS1 одржавање: Формат датума (веза)
Björnhag, G.; Becker, G.; Buchholz, C.; W. von Engelhardt, W. (1994). „The gastrointestinal tract of the rock hyrax (Procavia habessinica). 1. Morphology and motility patterns of the tract”. Comparative Biochemistry and Physiology A. 109 (3): 649—53. PMID8529006. doi:10.1016/0300-9629(94)90205-4.
Eugenie Barrow; Erik R. Seiffert; Elwyn L. Simons (2010). „A primitive hyracoid (Mammalia, Paenungulata) from the early Priabonian (Late Eocene) of Egypt”. Journal of Systematic Palaeontology. 8 (2): 213—244. S2CID84398730. doi:10.1080/14772010903450407.
Asher, R.J.; Novacek, M.J.; Geisher, J.H. (2003). „Relationships of endemic African mammals and their fossil relatives based on morphological and molecular evidence”. Journal of Mammalian Evolution. 10: 131—194. S2CID39296485. doi:10.1023/A:1025504124129.
Natan Slifkin (2004-03-11). „Chapter Six – Shafan the Hyrax”(PDF). The Camel, the Hare, and the Hyrax. Архивирано из оригинала(PDF) 16. 6. 2012. г. Приступљено 25. 4. 2012.CS1 одржавање: Формат датума (веза)
Hendrichs, Hubert (1966). „Vergleichende Untersuchung des Wiederkauverhaltens” [Comparative investigation of cud retainers]. Biologisches Zentralblatt (dissertation) (на језику: немачки). 84 (6): 671—751. OCLC251821046. „All artiodactyl families and about 80% of the spp. were investigated. Chewing regurgitated fodder is an idle pastime, as well as an instinct associated with appetite. Characteristic movements were analyzed for undisturbed samples of animals maintained on preserves. Group-specific differences are reported in form, rhythm, frequency, and side of chewing motion. The ungulate type is characterized as a specialization. The operation is described for the first time for the order Hyracoidea. On the basis of 12 spp. of the marsupial subfamily Macropodinae rumination is inferred for the whole category. Advantages of the process are debated”
Natan Slifkin (2004-03-11). „Chapter Six – Shafan the Hyrax”(PDF). The Camel, the Hare, and the Hyrax. Архивирано из оригинала(PDF) 16. 6. 2012. г. Приступљено 25. 4. 2012.CS1 одржавање: Формат датума (веза)