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Spencer Collection, The New York Public Library. "Cygnus (Dajâjah), as seen on a celestial globe (upside down)" The New York Public Library Digital Collections. 1630 - 1633. https://digitalcollections.nypl.org/items/08e5dba0-9f75-0137-1150-3f91632a5f58
Spencer Collection, The New York Public Library. "Cygnus (Dajâjah), as seen on a celestial globe (upside down)" New York Public Library Digital Collections. Accessed January 16, 2025. https://digitalcollections.nypl.org/items/08e5dba0-9f75-0137-1150-3f91632a5f58
Spencer Collection, The New York Public Library. (1630 - 1633). Cygnus (Dajâjah), as seen on a celestial globe (upside down) Retrieved from https://digitalcollections.nypl.org/items/08e5dba0-9f75-0137-1150-3f91632a5f58
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/08e5dba0-9f75-0137-1150-3f91632a5f58 | title=
(still image)
Cygnus (Dajâjah), as seen on a celestial globe (upside down), (1630 - 1633)|author=Digital Collections, The New York Public Library |accessdate=January 16, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>