- https://www.fbi.gov/history/famous-cases/alcatraz-escape
- https://www.history.com/topics/crime/alcatraz-video
- https://www.history.com/specials/alcatraz-escape-the-lost-evidence
- https://youtu.be/-gjqGdRhYtY
- https://www.telegraph.co.uk/news/2018/01/24/mysterious-letter-reopens-case-whether-alcatraz-escapees-survived/