Abramson, J., Speer, B. L., & Thomsen, J.B. 1999, "The Large Macaws, Their Care and Breeding", Raintree Publications:CA
Fuller, Errol (1987). Extinct Birds. Penguin Books (England). pp. 148–9. ISBN 0-670-81787-2.
Wetmore, A. (1937). "Ancient records of birds from the island of St. Croix with observations on extinct and living of Puerto Rico.". Journal of Agriculture of the University of Puerto Rico 21 (1): 5–16.
Snyder, N.; McGowan, P.; Gilardi, J.; Grajal, A., eds. (2000). Parrots: Status Survey and Conservation Action Plan 2000–2004. Gland, Switzerland, and Cambridge, UK: IUCN. ISBN 9782831705040.
Gilardi, James D. (1996). Ecology of Parrots in the Peruvian Amazon: Habitat Use, Nutrition, and Geophagy (Ph.D.). Davis, California: University of California at Davis.
Brightsmith, D. J. (2004). "Effects of Weather on Parrot Geophagy in Tambopata, Peru". The Wilson Bulletin 116 (2): 134–145. JSTOR 4164648.
Brightsmith, Donald J.; Muñoz-Najar, Romina Aramburu (2004). "Avian Geophagy and Soil Characteristics in Southeastern Peru". Biotropica 36 (4): 534–543. doi:10.1111/j.1744-7429.2004.tb00348.x.
Powell, Luke L.; Powell, Thomas U.; Powell, George V. N.; Brightsmith, Donald J. (2009). "Parrots Take it with a Grain of Salt: Available Sodium Content May Drive Collpa(Clay Lick) Selection in Southeastern Peru". Biotropica 41 (3): 279–282. doi:10.1111/j.1744-7429.2009.00514.x.
Kaspari, M.; Yanoviak, S. P.; Dudley, R. (2008). "On the biogeography of salt limitation: A study of ant communities" (PDF). Proceedings of the National Academy of Sciences 105 (46): 17848. Bibcode:2008PNAS..10517848K. doi:10.1073/pnas.0804528105.
Lee, Alan T. K.; Kumar, Sunil; Brightsmith, Donald J.; Marsden, Stuart J. (2009). "Parrot claylick distribution in South America: Do patterns of "where" help answer the question "why"?". Ecography: 503–513. doi:10.1111/j.1600-0587.2009.05878.x.
Lee, A.T.K. 2010. Parrot Claylicks: Distribution, Patterns Of Use And Ecological Correlates From A Parrot Assemblage In Southeastern Peru, PhD Dissertation, Manchester Metropolitan University Parrots and claylicks dissertation
Brightsmith, D. J. 2006. The psittacine year: what drives annual cycles in Tambopata's parrots? Proceedings of the Loro Parque International Parrot Symposium, Tenerife, Spain.
