Gary Cole on Being NCIS’ Mark Harmon Replacement: ‘Alden Parker Was Nothing Like Gibbs’ - IMDb

Is Lala Dead, Crossovers, Mark Harmon, 7 More Burning Questions for 'NCIS,' 'Origins,' 'Sydney' - TV Insider

‘He’ll Orchestrate Something’ Fans Hope To See Mark Harmon’s Gibbs Appear On This Upcoming NCIS Spinoff, But Could It Happen? - Game Rant

'NCIS's Mark Harmon Had One Box Office Hit in His Career - MovieWeb

'I Don't Think I Would Have Been There' Mark Harmon Shared Why He Said Yes To His Iconic NCIS Role Gibbs (It's Not What You Think) - Game Rant

NCIS Fans Should Watch Mark Harmon In The West Wing Season 3 - MSN

Gary Cole Took Over From Mark Harmon On NCIS, And The Actor Told Me Why He Thought Alden Parker Got A ‘Really Good Entrance’ - Yahoo

Gary Cole Took Over From Mark Harmon On NCIS, And The Actor Told Me Why He Thought Alden Parker Got A ‘Really Good Entrance’ - cinemablend.com

NCIS Fans Should Watch Mark Harmon In The West Wing Season 3 - Game Rant

Long Before 'NCIS,' Mark Harmon Took a Swing — and Missed — in This Forgotten Comedy - Collider

Did Mark Harmon Come Back To NCIS Season 22? Gibbs's Recent Return, Explained - Game Rant

How Did Mark Harmon Return for the 'NCIS' Spin-off 'Origins'? - Collider

How Mark Harmon Returns to ‘NCIS’ Spinoff 'Origins' - Collider

Mark Harmon reveals how he's able to sustain stardom in Hollywood - The News International

Mark Harmon's Big NCIS: Origins' Lala Confession Is Insulting To Gibbs' Arc In The Flagship - Screen Rant