Or, how do you know what is what?
Let’s start with the basics:
When you are referencing your information sources you use citations within your text. These are brief, just names and a date in brackets, in your text.
Then at the end of your essay or assignment you have a reference list. This is a list of everything you have cited, with each reference providing the full details of the works you have cited in your writing.
This means if someone reading your work sees an interesting idea they can use the citation to find the matching reference, and then use the details in the reference to find the original work to read for themselves.