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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Wirkkalla slack sky line system works well up or down hill for distances up to three thousand feet. Seattle, Washington." The New York Public Library Digital Collections. 1935 - 1938. https://old-digitalcollections.nypl.org/items/7ce0ee10-dd07-013e-9f2e-0242ac110003
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Wirkkalla slack sky line system works well up or down hill for distances up to three thousand feet. Seattle, Washington." New York Public Library Digital Collections. Accessed September 25, 2026. https://old-digitalcollections.nypl.org/items/7ce0ee10-dd07-013e-9f2e-0242ac110003
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1935 - 1938). Wirkkalla slack sky line system works well up or down hill for distances up to three thousand feet. Seattle, Washington. Retrieved from https://old-digitalcollections.nypl.org/items/7ce0ee10-dd07-013e-9f2e-0242ac110003
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/7ce0ee10-dd07-013e-9f2e-0242ac110003 | title=
(still image)
Wirkkalla slack sky line system works well up or down hill for distances up to three thousand feet. Seattle, Washington., (1935 - 1938)|author=Digital Collections, The New York Public Library |accessdate=September 25, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>