IMDb: Martika: The Internet Movie Database has Martika's filmography as well as some biographical information.
Magical Place: A Martika fan site with biography, pictures, discography, news, and links to related resources.
Martika Chilean Web Site: A fan site with pictures and audio clips from the Viña del Mar Festival (Chile, 1991).
Yahoo Groups: Martika: An e-mail based discussion group for Martika fans. Includes a message archive.