Sometimes, the link in OneSearch brings you to the journal's index, where all the issues are listed by year, volume, and issue. instead of the article. It does not mean that the article is not available.
Search for the article in the resource page again, or locate the article by year, volume, and issue.
*How do you know what year, volume, and issue number the article was published in? This information is available in the Library Record, under the author(s)'s names
This will bring you to the list of articles that was published in that issue. Click on the article for full-text.