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Munoz, Samuel E.; Schroeder, Sissel; Fike, David A.; Williams, John W. (2014). "A record of sustained prehistoric and historic land use from the Cahokia region, Illinois, USA". Geology. 42 (6): 499–502. Bibcode:2014Geo....42..499M. doi:10.1130/g35541.1.
"Cahokia Mounds". National Historic Landmark summary listing. National Park Service. Archived from the original on March 3, 2008. Retrieved July 23, 2008.
"Ancient Cahokia". WashingtonPost.com. March 12, 1997. Retrieved December 16, 2021.
web.archive.org
"Cahokia Mounds". National Historic Landmark summary listing. National Park Service. Archived from the original on March 3, 2008. Retrieved July 23, 2008.