Using Reference Letters Properly?

If you list the job on your resume, then the reference letters are good. They tell what a good job you did and that your employers appreciated you. I would not include them with my resume but maybe make reference to them in your cover letter. When I go in for the interview, I take my references and personally hand them to whoever is interviewing me or supply them earlier if they ask for them. Keep those originals. They are good stuff and can get you hired over other people. They never expire but make it obvious that over the years you have done a good job and have been liked by your employers.