- Seamus Heaney. Door into the Dark. London: Faber and Faber, 1969.
Cavanagh, Michael. "Seamus Heaney Returning." Journal of Modern Literature, vol. 22, no. 1, 1998, pp. 117-129. ProQuest, https://search.proquest.com/docview/201669799?accountid=35803.
Craig, Patricia. “TP Flanagan: Artist and Teacher Whose Work Inspired Seamus Heaney.” The Independent, Independent Digital News and Media, 23 Oct. 2011, www.independent.co.uk/news/obituaries/tp-flanagan-artist-and-teacher-whose-work-inspired-seamus-heaney-2269579.html.
Pratt, William. "The Great Irish Elk: Seamus Heaney's Personal Helicon." World Literature Today, vol. 70, no. 2, 1996, pp. 260. ProQuest, https://search.proquest.com/docview/209382259?accountid=35803.