But, you should do whatever works for you. Since we live in the age of the Internet, this is usually a URL or hyperlink where the material resides. Standard templates Be careful if you copy the following templates, the % sign is not valid to comment out lines in bibtex files. If you want to comment out a line, you have to put it outside the entry. @article An article from a magazine or a journal. Everything after the key is the reference itself. This is the scheme that I use in this tutorial.