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