Quellen:
https://de.wikipedia.org/wiki/Todesfall_Gareth_Williams
https://www.buzzfeednews.com/article/tomwarren/secrets-of-the-spy-in-the-bag#.lobLpoKwm
https://www.spiegel.de/fotostrecke/gareth-williams-tod-eines-agenten-fotostrecke-103742.html
https://www.theguardian.com/uk/2012/may/02/gareth-williams-mysterious-death-mathematician
https://www.telegraph.co.uk/news/uknews/law-and-order/9240639/Gareth-Williams-timeline-how-the-mystery-of-the-spy-in-the-bag-unfolded.html
https://www.express.co.uk/news/uk/442798/MI6-spy-is-found-dead-after-locking-himself-in-holdall-in-tragic-accident-police-reveal