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Condit, Carl W. (1959). "Sullivan's Skyscrapers as the Expression of Nineteenth Century Technology". Technology and Culture. 1 (1): 78–93. doi:10.2307/3100790. JSTOR3100790.
"Eads Bridge". National Historic Landmark summary listing. National Park Service. Archived from the original on December 6, 2008. Retrieved July 3, 2008.
"Eads Bridge". National Historic Landmark summary listing. National Park Service. Archived from the original on December 6, 2008. Retrieved July 3, 2008.