Rheindt, F.E. & Eaton, J.A. (2009) Species limits in Pteruthius (Aves: Corvida) shrike-babblers: a comparison between the Biological and Phylogenetic Species Concepts. Zootaxa, 2301 (1), 29–54.
https://doi.org/10.11646/zootaxa.2301.1.2