I'm pretty sure the PSM-25 is a French scale. Is that what you wanted? If not, you might consider substituting the PSS-10 (Sheldon Cohen's measure) or one of its cousins. I'm attaching a link to his laboratory's web page, which includes copies of scales as well as related articles.
Aida and Stephen have provided you the identical information that I was going to supply you. I do believe it is open access however, contacting the authors for permission in writing is always best practice.