Parker, Michael (1993). Seamus Heaney: The Making of the Poet. Iowa City: University of Iowa Press. p. 221. ISBN0-87745-398-5. «The deaths of his mother in the autumn of 1984 and of his father in October 1986 left a colossal space, one which he has struggled to fill through poetry.»
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«Faces of the week»(en inglés británico). 19 de enero de 2007. Consultado el 20 de marzo de 2020.