^Langley, P. J. W.; Yalden, D. W. (1977). "The decline of the rarer carnivores in Great Britain during the nineteenth century". Mammal Review. 7 (3–4): 113.
doi:
10.1111/j.1365-2907.1977.tb00363.x.
^Langley, P. J. W.; Yalden, D. W. (1977). "The decline of the rarer carnivores in Great Britain during the nineteenth century". Mammal Review. 7 (3–4): 113.
doi:
10.1111/j.1365-2907.1977.tb00363.x.