Not all databases provide the full-text of articles. Some like BAS are citation only. In most cases there will be a UMLinks button that you can click that will search our local information and tell you if there is an e-text available, print copy in the 5 colleges, or if you need to request a copy through interlibrary loan. It costs the library quite a bit of money to purchase the articles on your behalf - so wse interlibrary loan wisely.
Sometimes you want to work backwards. You see a citation in a book or article that you want to read. Use the citation linker to see if the Library has the item.