- The New York Times [Bosley Crowther]
- Associated Press [Bob Thomas]
- Best Adapted Screenplay: 1963 [Erik Beck]
- Channel 4 Film [capsule review]
- Chicago Reader [Jonathan Rosenbaum]
- Cold War Film & Culture [Eric Gilliland]
- Dennis Schwartz [Dennis Schwartz]
- derekwinnert.com [Derek Winnert]
- DoBlu.com Blu-ray [Matt Paprocki]
- DVD Savant [Glenn Erickson]
- DVD Talk [Glenn Erickson]
- Flickers in Time
- KQEK.com [Mark R. Hasan]
- MoviePass Islington
- Rotten Tomatoes - Reviews from the Nation's Top Critics
- The Kim Newman Website (Kim Newman)
- The New Yorker [Pauline Kael]
- The Rome News-Tribune [Eugene Burdick], Pt. 1
- The Rome News-Tribune [Eugene Burdick], Pt. 2
- The Seattle Post -Intelligencer (William Arnold)
- The Village Voice [Andrew Sarris]
- themagnificent60s [Brian Hannan]
- tt0056632
- TV Guide
- Variety
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