Willy's Planet Jorden was developed for Windows 3.1 and Macintosh, and was first published in Norway in 1995 as a hybrid CD-ROM by Katz Media. After setting a Norwegian sales-record of 10,000 units in 1996, it was released as Whitworth's Planet Earth in the United States by Cognigen. It was also localized for release in French, German, Swedish and Danish languages.
- Whitworth's Planet Earth, Katz Media AS. Archived 1997-10-23.
- Whitworth's Planet Jorden og dens fantastiske naturskatte (Norwegian) by Katz Media, DBC Medier. 1995. Worldcat OCLC: 60964485
- Whitworth's Planet Earth - Awards, Cognigen Corporation. Archived 1999-08-31.
- Distributors Wanted, Katz Media AS. Archived 1998-07-02.