Kirwan, Guy M., Nathan H. Rice, Povl Jørgensen, and Nigel J. Collar. 2026. “Prevailing Usage Versus Priority: a Revision of the Types and Nomenclature of the Pionus menstruus (Linnaeus, 1766) Species Group (Aves: Psittacidae)”. Zootaxa 5831 (2). Auckland, New Zealand:233-44. https://doi.org/10.11646/zootaxa.5831.2.5.