O'Dell, Larry. "Urschel Kidnapping". Oklahoma Historical Society. Encyclopedia of Oklahoma History and Culture. Archived from the original on December 28, 2014. Retrieved May 11, 2012.
O'Dell, Larry. "Urschel Kidnapping". Oklahoma Historical Society. Encyclopedia of Oklahoma History and Culture. Archived from the original on December 28, 2014. Retrieved May 11, 2012.