Wilson, Scott; Martin, Kathy (2008). "Breeding habitat selection of sympatric White-tailed, Rock and willow ptarmigan in the southern Yukon Territory, Canada". Journal of Ornithology. 149 (4): 629–637. Bibcode:2008JOrni.149..629W. doi:10.1007/s10336-008-0308-8. S2CID21970775.
Stokkan, K. A. (1992). "Energetics and adaptations to cold in Ptarmigan in winter". Ornis Scandinavica. 23 (3): 366–370. doi:10.2307/3676662. JSTOR3676662.
Wilson, Scott; Martin, Kathy (2008). "Breeding habitat selection of sympatric White-tailed, Rock and willow ptarmigan in the southern Yukon Territory, Canada". Journal of Ornithology. 149 (4): 629–637. Bibcode:2008JOrni.149..629W. doi:10.1007/s10336-008-0308-8. S2CID21970775.
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jstor.org
Stokkan, K. A. (1992). "Energetics and adaptations to cold in Ptarmigan in winter". Ornis Scandinavica. 23 (3): 366–370. doi:10.2307/3676662. JSTOR3676662.
Válóczi, Tibor (1999): A Vaskapu-barlang (Bükk-hegység) felső pleisztocén faunájának vizsgálata [Investigation of the Upper-Pleistocene fauna of Vaskapu-Cave (Bükk-mountain)]. Folia Historico Naturalia Musei Matraensis23: 79–96 ISSN 0134-1243 [Hungarian with English abstract]. Page with link to PDF fulltext
Wilson, Scott; Martin, Kathy (2008). "Breeding habitat selection of sympatric White-tailed, Rock and willow ptarmigan in the southern Yukon Territory, Canada". Journal of Ornithology. 149 (4): 629–637. Bibcode:2008JOrni.149..629W. doi:10.1007/s10336-008-0308-8. S2CID21970775.