Yang, J., X. Liu, J. Zhang, B. Qing, and B. Lu. “Genetics and Evolution of Plumage Color in Crested Ibis: Analysis of the Melanocortin-1 Receptor (MC1R)”. Cellular and Molecular Biology, vol. 61, no. 4, Aug. 2015, pp. 63-69, https://cellmolbiol.org/index.php/CMB/article/view/689.