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| Elizabeth Eva Leach
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Sung Birds: Music, Nature, and Poetry in the Later Middle Ages
(Ithaca: Cornell University Press, 2007) 
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| Wendy Pfeffer
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The Change of Philomel: The Nightingale in Medieval Literature
(New York: Peter Lang, 1985) 
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| Wendy Pfeffer, Willene B. Clark & Meradith T. McMunn, ed.
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Spring, love, birdsong: the nightingale in two cultures
(in Willene B. Clark & Meradith T. McMunn, ed., Beasts and Birds of the Middle Ages. The Bestiary and its Legacy, Philadelphia: University of Pennsylvania Press, 1989, 88-95) 
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| Suzetta Tucker
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Christian Legends & Symbols
(Suzetta Tucker, 1999)
 Web site/resource link
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