If Adelphi University Libraries doesn't have the full text of an article you are looking for it may be available through Interlibrary Borrowing. Interlibrary Borrowing is available for current students. There is no fee for you to request items through Interlibrary Borrowing.
The databases/OneSearch will make if very clear when to Request through Interlibrary Borrowing. You will follow the steps once you click on Request through Interlibrary Borrowing.
If you come across something where the vendor is asking you to pay for access to an article, NEVER PAY. You can request the article through Interlibrary Borrowing. To manage your Interlibrary Borrowing items you can access your account on the menu at the top of the OneSearch page.