O'Flaherty, Roderic.A Chorographical Description of West Or H-Iar Connaught: Written A.D. 1684 : [англ.]. — For the Irish Archaeological Society, 1846. — «…and the amphibious otter, of which kind the white-faced otter is very rare. It is never killed, they say, but with loss of man or dog, and its skin is mighty precious.».
