«Northrop Grumman to Upgrade Portuguese Air Force F-16s With LITENING Advanced Targeting System»(en inglés). Northrop Grumman. 31 de julio de 2008. Consultado el 10 de diciembre de 2009. «The Portuguese Air Force today announced the selection of Northrop Grumman Corporation's (NYSE:NOC) third-generation LITENING Advanced Targeting (AT) system for their F-16 Advanced Targeting Pod upgrade program.»