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2. Britain sitting on a time-bomb. BBC news, September 1998.
http://news.bbc.co.uk/1/hi/uk/179387.stm
3. British Army Defuses Giant WWII-Era Bomb in London. Fox news, June 2008.
https://www.foxnews.com/story/british-army-defuses-giant-wwii-era-bomb-in-london
4. Zetica Ltd. - company website.
http://www.zeticauxo.com
5. World War II bomb kills three in Germany. BBC news, June 2010.
http://www.bbc.co.uk/news/10212890