Full-text not available for certain articles in ProQuest

How can I get full-text for an article that currently is not available in ProQuest?

Due to publishers restrictions, we may be unable to offer full-text for this article at this time. Please contact ProQuest Technical Support, and we can verify if this is the case. Please include the following information with your correspondence:

1. Article Title

2. Publication

3. Issue/Volume

4. Issue Date

5. Author

6. Page Number

You might check on the publisher's website to see if they offer this article in full-text. Also, you may need to check with your school library to see if they have this article in hard copy or microfilm.