All-Reviews.com: Reviews of the movie.
HARO Online: The Thomas Crown Affair: Summary and review of the film.
IMDb: The Thomas Crown Affair (1999): Cast, credits, plot summary, viewer comments, plus other information about the film.
Preview Online: Article with photographs, behind-the-scenes information, and quotes from the stars and filmmakers.
Rotten Tomatoes: The Thomas Crown Affair: Includes reviews and synopsis.