“Libya: Is cost of military mission sustainable?”. www.bbc.co.uk (22 March 2011). 9 April 2011閲覧。 “Prof Charmers says the cost of a single cruise missile is about £500,000, while a single Tornado sortie is about £30,000 - in fuel alone”
Collins, Nick (9 April 2011). “The checkered history of HMS Astute”. Daily Telegraph. 9 April 2011閲覧。 “HMS Astute – by this point dubbed "HMS Calamity" – was reported to have a fault in her steam plant.”
