"Charles Sampson". George Paul Memorial Bullriding Del Rio Texas. www.georgepaulmemorialbullriding.com. Archived from the original on July 31, 2018. Retrieved August 5, 2018.
"Charles Sampson". George Paul Memorial Bullriding Del Rio Texas. www.georgepaulmemorialbullriding.com. Archived from the original on July 31, 2018. Retrieved August 5, 2018.