You must find at least 2 primary journal articles (also called research articles) about an organelle.
A primary research article is a journal article that reports the author(s) findings about research that the author(s) conducted.
Once you have found an article, look for these sections (they may not always be designated with section headers:
There are other clues that you have found a primary research article. These are general rules of thumb, but aren't true for all primary research articles: