Reference refers to sources that we turn to for quick introductory information. Use it to:
This first image shows an excerpt from an article titled "Code Switching" published in Asian American Society: an Encyclopedia. The images below show a definition of code-switching, suggest related concepts, and discuss motivations behind code switching.
click on images to enlarge
The images below of an article titled "Multilingualism" point to how useful reference can be. Note how the article:
The other essential thing to understand about reference articles is that their purpose is to be informative and not take a stand on issues, events, etc.