Rheindt, Frank E., and James A. Eaton. “Species Limits in Pteruthius (Aves: Corvida) Shrike-Babblers: A Comparison Between the Biological and Phylogenetic Species Concepts”. Zootaxa 2301, no. 1 (December 1, 2009): 29–54. Accessed June 24, 2025. https://www.mapress.com/zt/article/view/zootaxa.2301.1.2.