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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. "Sir C.W. Siemens, D.C.L., F.R.S., &c. The electric knight-light." The New York Public Library Digital Collections. 1883-07-28. https://digitalcollections.nypl.org/items/b7868fe1-ba56-7a25-e040-e00a1806666b
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. "Sir C.W. Siemens, D.C.L., F.R.S., &c. The electric knight-light." New York Public Library Digital Collections. Accessed April 23, 2024. https://digitalcollections.nypl.org/items/b7868fe1-ba56-7a25-e040-e00a1806666b
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. (1883-07-28). Sir C.W. Siemens, D.C.L., F.R.S., &c. The electric knight-light. Retrieved from https://digitalcollections.nypl.org/items/b7868fe1-ba56-7a25-e040-e00a1806666b
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/b7868fe1-ba56-7a25-e040-e00a1806666b | title=
(still image)
Sir C.W. Siemens, D.C.L., F.R.S., &c. The electric knight-light., (1883-07-28)
|author=Digital Collections, The New York Public Library |accessdate=April 23, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>