If you have checked the Online Catalog and all relevant databases and have come to the conclusion that Regent does not have the item you need, your next step is to check OCLC's FirstSearch WorldCat.
WorldCat is a "Union Catalog" which combines holdings information from most large libraries around the world. It provides detailed information on library holdings and is a vital part of the interlibrary loan process!
Step-by-step info on how to search WorldCat is provided below. BUT here's the summary: