del Hoyo, J., L. Fishpool, N. Collar, J. Tobias, G. M. Kirwan, and P. F. D. Boesman (2021). Gray-cheeked Bulbul (Alophoixus tephrogenys), version 1.0. In Birds of the World (P. C. Rasmussen, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.gycbul2.01