Persoon, James, and Robert R. Watson. The Facts On File Companion to British Poetry, 1900 to Present. New York: Facts On File, Inc., 2009. (Updated 2011.) Bloom's Literature. Facts On File, Inc. Web. 9 Feb. 2016.
Bloom, Harold, ed. Seamus Heaney, Bloom's Major Poets. Philadelphia: Chelsea House Publishing, 2002. (Updated 2013.) Bloom's Literature. Facts On File, Inc. Web. 9 Feb. 2016.
Persoon, James, and Robert R. Watson. The Facts On File Companion to British Poetry, 1900 to Present. New York: Facts On File, Inc., 2009. (Updated 2011.) Bloom's Literature. Facts On File, Inc. Web. 9 Feb. 2016.
Persoon, James, and Robert R. Watson. The Facts On File Companion to British Poetry, 1900 to Present. New York: Facts On File, Inc., 2009. (Updated 2011.) Bloom's Literature. Facts On File, Inc. Web. 9 Feb. 2016.
Persoon, James, and Robert R. Watson. The Facts On File Companion to British Poetry, 1900 to Present. New York: Facts On File, Inc., 2009. (Updated 2011.) Bloom's Literature. Facts On File, Inc. Web. 9 Feb. 2016.
Persoon, James, and Robert R. Watson. The Facts On File Companion to British Poetry, 1900 to Present. New York: Facts On File, Inc., 2009. (Updated 2011.) Bloom's Literature. Facts On File, Inc. Web. 9 Feb. 2016.
