To save an article from one of the Library's databases, look for the Google Drive icon in the toolbar, which is usually located along the top, or the right sidebar, and follow the prompts.
Or you can download it to your computer and upload it to your Google Drive. From Google Drive, click the New button, then select File upload. Find your file, and click Open.
GCFGlobal.org has many tutorials on using Google Apps. See this tutorial on Uploading Files to Google Drive .