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© The New York Public Library, 2026
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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Inoculation of guinea pig. Experimental farm of Department of Agriculture, Prince George's County, Maryland." The New York Public Library Digital Collections. 1935. https://old-digitalcollections.nypl.org/items/12bf9540-c4da-013e-108b-0242ac110002
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Inoculation of guinea pig. Experimental farm of Department of Agriculture, Prince George's County, Maryland." New York Public Library Digital Collections. Accessed September 23, 2026. https://old-digitalcollections.nypl.org/items/12bf9540-c4da-013e-108b-0242ac110002
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1935). Inoculation of guinea pig. Experimental farm of Department of Agriculture, Prince George's County, Maryland. Retrieved from https://old-digitalcollections.nypl.org/items/12bf9540-c4da-013e-108b-0242ac110002
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(still image)
Inoculation of guinea pig. Experimental farm of Department of Agriculture, Prince George's County, Maryland., (1935)|author=Digital Collections, The New York Public Library |accessdate=September 23, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>