The website is https://scholar.google.com/ and it allows students to search for scholarly articles on subjects and put them into a library. Anything that they store in their library, they can then site through the use of one button with many different types of citation available. If they find a good article, they can search for like articles or for articles from the same source.
Please take a look at this one. It will really help the students find and use good sources and cite correctly.