http://www.english.uiuc.edu/maps/poets/g_l/hayden/hayden.htm
 

 http://longman.awl.com/kennedy/hayden/biography.html
 

 http://www.britannica.com/magazine?ebsco_id=245481
 

 http://www.findarticles.com/cf_0/m2278/3_23/54925297/p1/article.jhtml?term=
 

 http://valencia.cc.fl.us/lrcwest/hayden.html