“Number of Inhabitants: Ohio”(PDF). 《18th Census of the United States》. U.S. Census Bureau. 1960. 2020년 4월 26일에 확인함.
noaa.gov
ncei.noaa.gov
“Station: Athens OU, OH”. 《U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991-2020)》. National Oceanic and Atmospheric Administration. 2021년 8월 7일에 확인함.