- U.S. Geological Survey Geographic Names Information System: Cumro, Nebraska
- "Custer County". Jim Forte Postal History. Archived from the original on 7 November 2014. Retrieved 25 August 2014.
- Fitzpatrick, Lillian L. (1960). Nebraska Place-Names. University of Nebraska Press. p. 46. A 1925 edition is available for download at University of Nebraska—Lincoln Digital Commons.
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