Ranker.com has compiled a list of Tom Selleck's Western roles in alphabetical order, complete with movie trailers. These films include his starring and supporting roles, as well as titles with cameo appearances by the actor. Most of the titles are movies made for television.
The Internet Movie Database has a comprehensive filmography of Tom Selleck's acting career, including projects currently in production. IMDB lists the titles in chronological order, beginning with the most recent films and television shows. One helpful feature of this site is that it provides links to television schedules and Amazon Instant Video, where fans can watch available shows and films.