– PopMatters, At Folsom Prison Legacy Edition review: popmatters.com — career context, 2008 Legacy Edition contents, DVD documentary interviewees. Accessed November 2026.
– American Blue Scene, ten facts about Folsom: americanbluesscene.com — January 10 El Rancho Motel registration, cast assembled, rehearsal details, Ronald Reagan’s visit, Hugh Cherry as MC, production details. Accessed November 2026.
– American Songwriter, Nickajack Cave: americansongwriter.com — 1967 cave incident details, Cash’s account, emerging from cave, June Carter and mother waiting outside, return to sober performing November 11 1967. Accessed November 2026.
– New World Encyclopedia, Johnny Cash: newworldencyclopedia.org — early biography, Sun Records, Columbia Records, drug arrests including El Paso 1965, forest fire damages, seven one-night jailings, prison advocacy, death September 12 2003. Accessed November 2026.
– Washington Examiner review: washingtonexaminer.com — amphetamine dosage details (20–30 pills, three to four times daily), Carnegie Hall 1962 impairment, 50% show cancellations by 1967. Accessed November 2026.
– Shackleton, Ernest. South: The Story of Shackleton’s Last Expedition. William Heinemann, 1919. [Prior article, retained for context.]
– Library of Congress National Recording Registry designation, 2003.
– Grammy Hall of Fame induction, 2018.
– Rolling Stone 500 Greatest Albums, 2003 and 2020 editions.