Amerikaanse ekster: Verskil tussen weergawes
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Lyn 35:
* Charles H. Trost – ''{{lang|en|[http://bna.birds.cornell.edu/bna/species/389/articles/introduction Black-billed Magpie (Pica hudsonia)]}}''. In: A. Poole: ''{{lang|en|[http://bna.birds.cornell.edu/bna The Birds of North America Online]}}''. Cornell Lab of Ornithology, Ithaca 1999. {{doi|10.2173/bna.389}}.
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