Seutin, G.; Ratcliffe, L. M.; Boag, P. T. (1995). "Mitochondrial DNA homogeneity in the phenotypically diverse redpoll finch complex (Aves: Carduelinae: Carduelis flammea - hornemanni)". Evolution. 49 (5): 962–973. doi:10.2307/2410418. JSTOR2410418.
Sangster, George; Knox, Alan G.; Helbig, Andreas J.; Parkin, David T. (2002). "Taxonomic recommendations for European birds". Ibis. 144 (1): 153–159. doi:10.1046/j.0019-1019.2001.00026.x.
jstor.org
Seutin, G.; Ratcliffe, L. M.; Boag, P. T. (1995). "Mitochondrial DNA homogeneity in the phenotypically diverse redpoll finch complex (Aves: Carduelinae: Carduelis flammea - hornemanni)". Evolution. 49 (5): 962–973. doi:10.2307/2410418. JSTOR2410418.