Peregrines at Derby Cathedral(PDF). Derbyshire Wildlife Trust, Derby Cathedral and Derby Museum & Art Gallery. [18 April 2011]. (原始内容(PDF)存档于October 2, 2011).
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Peregrines at Derby Cathedral(PDF). Derbyshire Wildlife Trust, Derby Cathedral and Derby Museum & Art Gallery. [18 April 2011]. (原始内容(PDF)存档于October 2, 2011).