- decolonialatlas (January 12, 2015). The Headwaters of the Mississippi River in Ojibwe. یوْخلانیلیبAugust 19, 2016.
- The United States Geological Survey recognizes two contrasting definitions of a river's source.USGS.gov By the stricter definition, the Mississippi would share its source with its longest tributary, the Missouri, at Brower's Spring in Montana. The other definition acknowledges "somewhat arbitrary decisions" and places the Mississippi's source at Lake Itasca, which is publicly accepted as the source,USGS.gov and which had been identified as such by Brower himself.MT.gov Archived 2012-01-18 at the Wayback Machine.
- Kammerer, J.C. (May 1990). Largest Rivers in the United States. U.S. Geological Survey. یوْخلانیلیبFebruary 22, 2011.