Smith, Huron H. (1928), Ethnobotany of the Meskwaki Indians, Bulletin of the Public Museum of the City of Milwaukee 4:175–326, page 217218 (Note: This source comes from the Native American ethnobotany database (http://naeb.brit.org/) which lists the plant as Oligoneuron rigidum var. rigidum. Accessed 19 January 2018
