Ussher, R. J. (1894). Birds of county Cork: Including all species known to have occurred in the county in a wild state, whether residents, summer or winter migrants, or occasional visitants : contributed to the Journal of Cork Historical and Archæological Society. Guy and Co..

Ussher, R. J. Birds of County Cork: Including All Species Known to Have Occurred in the County in a Wild State, Whether Residents, Summer or Winter Migrants, or Occasional Visitants : Contributed to the Journal of Cork Historical and Archæological Society. Guy and Co., 1894.