A couple of "first stops" for secondary sources (books, articles), especially if you do not need page-image (PDF) versions:
If the law library's Book + Articles, UCLS, and Google Scholar (see "Low-hanging fruit" tips, above) are not locating the article you need, or if they don't provide full text or a PDF (if your journal requires that format), see the further tips (sub-tabs of this page of the guide) for finding articles: