Wiggins, Martin (Production text commentary writer) (9 October 2006). The Sontaran Experiment (DVD). London, England: BBC Video/2 entertain. Event occurs at episode 1, 12:06–13:06. Retrieved 29 March 2007.
Wiggins, Martin (Production text commentary writer) (9 October 2006). The Sontaran Experiment (DVD). London, England: BBC Video/2 entertain. Event occurs at episode 1, 12:06–13:06. Retrieved 28 March 2007.