Benkman، C. W.؛ Parchman, T. L.؛ E. Mezquida (2010). "Patterns of coevolution in the adaptive radiation of crossbills". Annals of the New York Academy of Sciences. ج. 1206: 1–16. DOI:10.1111/j.1749-6632.2010.05702.x. PMID:20860680.
Benkman، C. W.؛ Parchman, T. L.؛ E. Mezquida (2010). "Patterns of coevolution in the adaptive radiation of crossbills". Annals of the New York Academy of Sciences. ج. 1206: 1–16. DOI:10.1111/j.1749-6632.2010.05702.x. PMID:20860680.