1. Alt, Susan M. (2019) A Search for Vibrant Matter in Greater Cahokia. In New Materialisms and Ancient Urbanisms, edited by Susan M. Alt and Timothy R. Pauketat, pp. 19–39. Routledge, Abingdon, United Kingdom.
2. Anderson, Jerrel C. (2019) The Steel Earthworks in 1979. Electronic document, http://www.jerrelcanderson.com/the-steel-earthworks-in-1979/, accessed March 20, 2020.
3. Applegate, Darlene (2005) Woodland Taxonomy in the Middle Ohio Valley: A Historical Overview. In Woodland Period Systematics in the Middle Ohio Valley, edited by Darlene Applegate and Robert C. Mainfort Jr., pp. 1–18. University of Alabama Press, Tuscaloosa.
4. Bronk Ramsey, Christopher (2017) OxCal 4.3. Electronic document, https://c14.arch.ox.ac.uk/oxcal/OxCal.html, accessed May 24, 2020.
5. Brown, James B. (2012) Mound City: The Archaeology of a Renown Ohio Hopewell Mound Center. Special Report 6. Midwest Archaeological Center, Lincoln, Nebraska.