Thousands of books, newspapers, magazines and Web sites, both official and unofficial, offer movie and video reviews these days. But many of them do not include ratings or content explanations for the films.

Following is only a partial list of sources for Motion Picture Association of America ratings, both past and present, as well as content guides and explanations of the ratings system:Published resources:

- The Deseret News Friday Weekend Sections. Includes a calendar of movie listings and ratings and content explanations. Information is also available on the paper's web site, (www.desnews.com) by hitting the "Lifestyle" button and clicking on movie listings.

- VideoHound's Golden Movie Retriever. A guide to films on videocassette, laserdisc and other formats. (Trade paperback, $19.95.)

- Video Movie Guide 1998. Another reference book featuring mini-reviews of films on videocassette and laserdisc. (Paperback, $7.99)

Online resources:

- The Motion Picture Association of America Web site (www.mpaa.com). Features a full listing of MPAA ratings.

- The Internet Movie Database (uk.imdb.com). Also includes an index with current movie cast and production lists for more than 150,000 different titles.

- The U.S. Movie Database (us.moviedatabase.com. A similar site, but with fewer movie listings.

- Infolink (www.infolink.org). Includes links to movie sites that list movie ratings.

- E! Online (eonline.com). An entertainment Web site for the E! cable television station that lists upcoming movie releases, including ratings.

- The Video Star home page (videostar.com). An online video guide that is much smaller in scale compared to the published movie reference books.

- The Movie Web home page (movieweb.com). Similar to the movie databases but with fewer listings. Also has links to other sites with rating and content lists.

- The Lifestyle.UK Home Page (lifestyle.uk). An entertainment site with MPAA ratings for European films released in the United States.

- The Sympatico Personal Web Space (www3.sympatico.ca). A Web site with movie ratings, as well as a movie "violence count."

- The Dove Organization (www.dove.org), a nonprofit foundation dedicated to family entertainment. Includes movie ratings reviews, as well as columns about the state of the entertainment industry.

In addition, there is a VideoHound Website featuring more up-to-date reviews and content listings (www.thomson.com). The MPAA also publishes a weekly update of film ratings, which is mailed bi-weekly. Those updates are available by writing to the Classification and Rating Administration, Motion Picture Association of America, Inc., 15503 Ventura Blvd., Encino, California 91436-3103.