Cita APA (7a ed.)
Northrop Grumman Corporation MarketLine Company Profile.
Cita Chicago Style (17a ed.)
Northrop Grumman Corporation MarketLine Company Profile.
Cita MLA (9a ed.)
Northrop Grumman Corporation MarketLine Company Profile.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.