From Wikipedia, the free encyclopedia
- U.S. Geological Survey Geographic Names Information System: Langdon, Missouri
- Eaton, David Wolfe (1916). How Missouri Counties, Towns and Streams Were Named. The State Historical Society of Missouri. p. 203.
- "Atchison County Place Names, 1928-1945 (archived)". The State Historical Society of Missouri. Archived from the original on 24 June 2016. Retrieved 30 August 2016.
- "Post Offices". Jim Forte Postal History. Retrieved 30 August 2016.
- National Park Service (2010-07-09). "National Register Information System". National Register of Historic Places. National Park Service.
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