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Powell, Roger (1982). "Evolution of Black-Tipped Tails in Weasels: Predator Confusion". The American Naturalist. 119 (1): 126–131. Bibcode:1982ANat..119..126P. doi:10.1086/283897.
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Montana Field Guide. "Long-tailed Weasel — Mustela frenata". Montana Natural Heritage Program and Montana Fish, Wildlife and Parks. Retrieved 3 June 2021.