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III. Sprague Electric Railway & Motor Co / Sprague Electric Company
Multiple unit system patent papers and patent litigation papers
Manuscripts and Archives Division, The New York Public Library. "M.U. Control Connections on back, looking from Middle of Car. D-4 Controller Normal Placed under Car" The New York Public Library Digital Collections. 1900. https://digitalcollections.nypl.org/items/510d47e3-d9d4-a3d9-e040-e00a18064a99
Manuscripts and Archives Division, The New York Public Library. "M.U. Control Connections on back, looking from Middle of Car. D-4 Controller Normal Placed under Car" New York Public Library Digital Collections. Accessed January 16, 2025. https://digitalcollections.nypl.org/items/510d47e3-d9d4-a3d9-e040-e00a18064a99
Manuscripts and Archives Division, The New York Public Library. (1900). M.U. Control Connections on back, looking from Middle of Car. D-4 Controller Normal Placed under Car Retrieved from https://digitalcollections.nypl.org/items/510d47e3-d9d4-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47e3-d9d4-a3d9-e040-e00a18064a99 | title=
(still image)
M.U. Control Connections on back, looking from Middle of Car. D-4 Controller Normal Placed under Car, (1900)|author=Digital Collections, The New York Public Library |accessdate=January 16, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>