Weaver, Bobby D. "Sinclair Oil and Refining Corporation". Encyclopedia of Oklahoma History and Culture. Retrieved November 14, 2011.[2]Archived October 10, 2011, at the Wayback Machine
Weaver, Bobby D. "Sinclair Oil and Refining Corporation". Encyclopedia of Oklahoma History and Culture. Retrieved November 14, 2011.[2]Archived October 10, 2011, at the Wayback Machine