Columbia subject headings:
Heaney, Seamus, 1939-2013--Criticism and interpretation.
Harvard subject headings:
Heaney, Seamus, 1939-2013--Criticism and interpretation.
Northern Ireland--In literature
Poets, Irish--20th century--Criticism and interpretation.
Princeton subject headings:
Heaney, Seamus, 1939-2013--Criticism and interpretation.