All-Reviews.com - Duplex: Reviews of the movie.
Chicago Sun-Times: Duplex: Roger Ebert's review.
HARO Online: Duplex: Review and pictures.
IMDb: Duplex (2003): Plot summary, trailer, cast and crew information, and user comments.
MovieWeb: Duplex: Synopsis, cast list, and pictures.
Rotten Tomatoes: Duplex: Links to reviews, cast and crew information, multimedia, and forum.