"Station: Cavalier 7NW, ND". U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991-2020). National Oceanic and Atmospheric Administration. Retrieved September 24, 2021.
postalhistory.com
"Pembina County". Jim Forte Postal History. Archived from the original on November 22, 2015. Retrieved October 25, 2015.