Sources :
Interview 1 (1995) : • Building a Time Machine | Art Bell interview
Interview 2 (1996) : • Time Travels | Art Bell interviews Michael Markum
Interview 3 (2015) : • Art Bell MITD - Mad Man Markum - Time Travels
Presse :
La vidéo de The Why Files : The Time Travel Mystery of Mike “Mad Man” Marcum
https://www.yahoo.com/news/‘Madman’ Mike Marcum’s bizarre radio confession
