T.  Warwick, ?Notes on the mammals of Barra, Mingulay and Berneray, Outer Hebrides?, Scottish Nat., vol. (1938), pp. 57?59, 1938.

R.  Hewson, ?The mountain hare in the scottish islands?, Scottish Nat., vol. 67, pp. 53?54, 1955.

S.  Angus and Hopkins, P., ?Rattus rattus confirmed in the Shiant Isles, Outer Hebrides?, Scottish Nat., vol. 109, pp. 33?38, 1997.