Vis, Robert; Henning, Dale (November 1969). "A Local Sequence for Mill Creek Sites in the Little Sioux River Valley". Plains Anthropologist. 14 (46): 253–271. JSTOR25666894.
Fishel, Robert (July 1997). "Medicine Birds and Mill Creek-Middle Mississippian Interaction: The Contents of Feature 8 at the Phipps Site (13CK21)". American Antiquity. 62 (3): 538–553. JSTOR282170.
"Phipps Site". National Historic Landmark summary listing. National Park Service. Archived from the original on June 6, 2011. Retrieved October 3, 2007.
web.archive.org
"Phipps Site". National Historic Landmark summary listing. National Park Service. Archived from the original on June 6, 2011. Retrieved October 3, 2007.