Be aware that the URL for an article in your browser bar usually isn't a permanent link to the article! One thing you might want to note when you find an article to make it easier to find again and cite is the article's permanent URL, often called a digital object identifier (DOI). Watch the videos below for an explanation of what a DOI is a how to use it in a citation. NOTE: the latter video is about APA but similarly applies to American Chemical Society (ACS) format, the citation format you will likely be using.