Gjershaug, J. O., O. H. Diserud, P. C. Rasmussen, and D. Warakagoda. “An Overlooked Threatened Species of Eagle: Legge’s Hawk Eagle Nisaetus Kelaarti (Aves: Accipitriformes)”. Zootaxa 1792, no. 1 (June 12, 2008): 54–66. Accessed April 4, 2025. https://mapress.com/zt/article/view/zootaxa.1792.1.4.