SOURCES:
- I Walked The Line by Vivian Cash
- My Darling Vivian dir. by Matt Riddlehoover (Documentary)
- Reprint of The Thunderbolt, via Civil Rights Heritage Museum
- [NY POST] Singer Johnny Cash Fights The Voice of Hate (10/6/66)
- [CBS BIRMINGHAM] A white supremacist versus the Man in Black: How a Birmingham church bomber tried to bring down Johnny Cash