Benkman, Craig W.; Young, Matthew A. (2020-03-04), Billerman, Shawn M; Keeney, Brooke K; Rodewald, Paul G; Schulenberg, Thomas S (eds.), "Red Crossbill (Loxia curvirostra)", Birds of the World, Cornell Lab of Ornithology, doi:10.2173/bow.redcro.01, retrieved 2021-07-05
Parchman, T. L.; C. W. Benkman (2006). "Patterns of genetic variation in the adaptive radiation of New World crossbills (Aves: Loxia)". Molecular Ecology. 15 (7): 1873–1887. doi:10.1111/j.1365-294x.2006.02895.x. PMID16689904. S2CID41768936.
Benkman, Craig W.; Young, Matthew A. (2020-03-04), Billerman, Shawn M; Keeney, Brooke K; Rodewald, Paul G; Schulenberg, Thomas S (eds.), "Red Crossbill (Loxia curvirostra)", Birds of the World, Cornell Lab of Ornithology, doi:10.2173/bow.redcro.01, retrieved 2021-07-05
Parchman, T. L.; C. W. Benkman (2006). "Patterns of genetic variation in the adaptive radiation of New World crossbills (Aves: Loxia)". Molecular Ecology. 15 (7): 1873–1887. doi:10.1111/j.1365-294x.2006.02895.x. PMID16689904. S2CID41768936.
Parchman, T. L.; C. W. Benkman (2006). "Patterns of genetic variation in the adaptive radiation of New World crossbills (Aves: Loxia)". Molecular Ecology. 15 (7): 1873–1887. doi:10.1111/j.1365-294x.2006.02895.x. PMID16689904. S2CID41768936.