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Manuscripts and Archives Division, The New York Public Library. "Music; 6-line green initial on gold field with gold lettering on band across center of initial reading "Potestates," one of the nine choirs of angels; names of other choirs occur on other leaves" The New York Public Library Digital Collections. 1440 - 1460. https://old-digitalcollections.nypl.org/items/510d47da-e3e4-a3d9-e040-e00a18064a99
Manuscripts and Archives Division, The New York Public Library. "Music; 6-line green initial on gold field with gold lettering on band across center of initial reading "Potestates," one of the nine choirs of angels; names of other choirs occur on other leaves" New York Public Library Digital Collections. Accessed September 26, 2026. https://old-digitalcollections.nypl.org/items/510d47da-e3e4-a3d9-e040-e00a18064a99
Manuscripts and Archives Division, The New York Public Library. (1440 - 1460). Music; 6-line green initial on gold field with gold lettering on band across center of initial reading "Potestates," one of the nine choirs of angels; names of other choirs occur on other leaves Retrieved from https://old-digitalcollections.nypl.org/items/510d47da-e3e4-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/510d47da-e3e4-a3d9-e040-e00a18064a99 | title=
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Music; 6-line green initial on gold field with gold lettering on band across center of initial reading "Potestates," one of the nine choirs of angels; names of other choirs occur on other leaves, (1440 - 1460)|author=Digital Collections, The New York Public Library |accessdate=September 26, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>