↑ David Fitzpatrick, "Emigration, 1801–70", in A New History of Ireland, vol. V: Ireland under the Union, I, 1801–70, ed. W. E. Vaughan (Oxford, 1989), 569; David Fitzpatrick, "Emigration, 1871–1921", in A New History of Ireland, vol. VI: Ireland under the Union, II, 1870–1921, ed. W. E. Vaughan (Oxford, 1996), 607
