"F-111K cost increases". Flight International. 91 (3032). Royal Aero Club: 616. 1967. Archived from the original on 6 March 2016. Retrieved 14 May 2013.
"F-111K cost increases". Flight International. 91 (3032). Royal Aero Club: 616. 1967. Archived from the original on 6 March 2016. Retrieved 14 May 2013.