MECH, L. David; CLUFF, H. Dean. Movements of Wolves at the Northern Extreme of the Species' Range, Including during Four Months of Darkness. PLoS ONE. Roč. 6, čís. 10. Dostupné online [cit. 2018-04-25]. DOI10.1371/journal.pone.0025328. (anglicky)
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MECH, L. David; CLUFF, H. Dean. Movements of Wolves at the Northern Extreme of the Species' Range, Including during Four Months of Darkness. PLoS ONE. Roč. 6, čís. 10. Dostupné online [cit. 2018-04-25]. DOI10.1371/journal.pone.0025328. (anglicky)