O'Brien, E. (2003). Seamus Heaney: Searches for answers. Pluto Press.
Cita Chicago (17th ed.)O'Brien, Eugene. Seamus Heaney: Searches for Answers. London ; Sterling, Va.: Pluto Press, 2003.
Cita MLA (9th ed.)O'Brien, Eugene. Seamus Heaney: Searches for Answers. Pluto Press, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.