The original source is: The self-regulation questionnaire. Brown, Janice M.; Miller, William R.; Lawendowski, Lauren A. VandeCreek, Leon (Ed); Jackson, Thomas L. (Ed). (1999). Innovations in clinical practice: A source book, Vol. 17 , (pp. 281-292). Sarasota, FL, US: Professional Resource Press/Professional Resource Exchange
That probably served as the "Manual," at least initially. I have a feeling this book may be difficult to procure, though Abe Books has a few used copies listed. You could also reconstruct the scale using the attached article (all the items are there).
Hello - Here also, is a website with the scale your seeking. You may need to secure copyright ? The stem goes back to a University, so your school may be able to get this source?
When an author publishes the actual items of a scale (whether it's in a journal article or on a web site), it constitutes permission for others to use the measure. But it can be a good idea to contact the author about your projected use. Sometimes you'll get useful advice or updates. And if they're keeping track of how the measure is used, your work may be cited in a subsequent review.