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Zink, Robert M. (1994). "The Geography of Mitochondrial DNA Variation, Population Structure, hybridization, and Species Limits in the Fox Sparrow (Passerella iliaca)". Evolution. 48 (1): 96–111. doi:10.2307/2410006. JSTOR2410006. PMID28567786.
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nih.gov
pubmed.ncbi.nlm.nih.gov
Zink, Robert M. (1994). "The Geography of Mitochondrial DNA Variation, Population Structure, hybridization, and Species Limits in the Fox Sparrow (Passerella iliaca)". Evolution. 48 (1): 96–111. doi:10.2307/2410006. JSTOR2410006. PMID28567786.