Mark Harmon's Gibbs Appears In NCIS' 1000th Episode (But Not How You Think) - Looper
Does Gibbs Appear In NCIS' 1000th Episode (Mark Harmon's Special Cameo Explained) - Screen Rant
Go Behind the Scenes of 'NCIS' With Mark Harmon & the Cast - TV Insider
Meet the new Gibbs: Mark Harmon's “NCIS: Origins” prequel series casts lead role - Yahoo Canada Shine On
NCIS’ Mark Harmon put his foot down when Gibbs was set for a completely different name - Express
Desktop versie