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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Automatic recording thermometer in cooperative creamery at Ruthven, Iowa. The latest scientific instruments are used here" The New York Public Library Digital Collections. 1936. https://digitalcollections.nypl.org/items/73a559f0-b449-0136-4f2f-498034dc3a45
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Automatic recording thermometer in cooperative creamery at Ruthven, Iowa. The latest scientific instruments are used here" New York Public Library Digital Collections. Accessed February 7, 2025. https://digitalcollections.nypl.org/items/73a559f0-b449-0136-4f2f-498034dc3a45
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1936). Automatic recording thermometer in cooperative creamery at Ruthven, Iowa. The latest scientific instruments are used here Retrieved from https://digitalcollections.nypl.org/items/73a559f0-b449-0136-4f2f-498034dc3a45
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/73a559f0-b449-0136-4f2f-498034dc3a45 | title=
(still image)
Automatic recording thermometer in cooperative creamery at Ruthven, Iowa. The latest scientific instruments are used here, (1936)|author=Digital Collections, The New York Public Library |accessdate=February 7, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>