- Columbia Journalism Review Ownership Chart [1]
- Interactive Media Ownership Map by Free Press [2]
- Find Out Who Owns the Media in Your Region [3] at the Center for Public Integrity
- Viacom Ownership Poster [4] by Center for International Media Action
Links:
[1] http://www.cjr.org/resources/
[2] http://www.freepress.net/ownership/chart/main
[3] http://projects.publicintegrity.org/telecom/
[4] http://www.mediaactioncenter.org/?q=node/339