Grayson, Donald K. (1991). "Late Pleistocene mammalian extinctions in North America: Taxonomy, chronology, and explanations". Journal of World Prehistory. 5 (3). Springer Netherlands: 193–231. doi:10.1007/BF00974990. S2CID162363534.
Bonacic, Cristián (1991). "Características biológicas y productivas de los camélidos sudamericanos". Avances en Ciencias Veterinarias (in Spanish). 6 (2). doi:10.5354/0716-260x.1991.4642 (inactive 25 August 2025).{{cite journal}}: CS1 maint: DOI inactive as of August 2025 (link)
Beula Williams (17 April 2007). "Llama Fiber". International Llama Association. Archived from the original on 6 November 2018. Retrieved 17 April 2007.
L. W. Johnson (17 April 2007). "Llama reproduction". College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins. 89 (11). National Library of Medicine and the National Institutes of Health: 219–22. PMID7232.
Grayson, Donald K. (1991). "Late Pleistocene mammalian extinctions in North America: Taxonomy, chronology, and explanations". Journal of World Prehistory. 5 (3). Springer Netherlands: 193–231. doi:10.1007/BF00974990. S2CID162363534.
Fowler, Murray E. (1 October 2016). "Camelids are not ruminants". Verterian Key (Veterinary Medicine Insight Engine). Chapter 46. Retrieved 29 May 2021.
Beula Williams (17 April 2007). "Llama Fiber". International Llama Association. Archived from the original on 6 November 2018. Retrieved 17 April 2007.