Penrose, Christopher D., Karen T. Ricker, and Larry C. Brown. Water Resources of Athens CountyArchived 2015年9月28日, at the Wayback Machine.. Ohioline. College of Food, Agricultural, and Environmental Sciences, Ohio State University. 2015年10月27日閲覧.
Penrose, Christopher D., Karen T. Ricker, and Larry C. Brown. Water Resources of Athens CountyArchived 2015年9月28日, at the Wayback Machine.. Ohioline. College of Food, Agricultural, and Environmental Sciences, Ohio State University. 2015年10月27日閲覧.