O'Regan, H.J., A. Turner & D.M. 2002. Wilkinson. European Quaternary refugia: a factor in large carnivore extinction? Journal of Quaternary Science 17(8) 789–795. (Full text pdfLưu trữ 2006-08-21 tại Wayback Machine)
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O'Regan, H.J., A. Turner & D.M. 2002. Wilkinson. European Quaternary refugia: a factor in large carnivore extinction? Journal of Quaternary Science 17(8) 789–795. (Full text pdfLưu trữ 2006-08-21 tại Wayback Machine)