ELIZABETH KNOWLES. "Hildegard of Bingen, St." The Oxford Dictionary of Phrase and Fable. Oxford University Press. 2006. Encyclopedia.com. 10 Nov. 2009 <http://www.encyclopedia.com>.
ELIZABETH KNOWLES. "Hildegard of Bingen, St." The Oxford Dictionary of Phrase and Fable. Oxford University Press. 2006. Encyclopedia.com. (November 10, 2009). http://www.encyclopedia.com/doc/1O214-HildegardofBingenSt.html
ELIZABETH KNOWLES. "Hildegard of Bingen, St." The Oxford Dictionary of Phrase and Fable. Oxford University Press. 2006. Retrieved November 10, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O214-HildegardofBingenSt.html