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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》 33 (3): 503–513. doi:10.1111/j.1600-0587.2009.05878.x.
Brightsmith, D. J. (2004). “Effects of Weather on Parrot Geophagy in Tambopata, Peru”. 《The Wilson Bulletin》 116 (2): 134–145. doi:10.1676/03-087b. JSTOR4164648.