Sources

http://www.poets.org/poet.php/prmPID/113

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http://thinkexist.com/quotes/ted_hughes/

http://www.brainyquote.com/quotes/authors/a/a_e_housman.html

http://www.brainyquote.com/quotes/authors/j/jack_prelutsky.html

http://www.poemhunter.com/jack-prelutsky/ http://www.poetryarchive.org/poetryarchive/singlePoet.do?poetId=7078