I need a Wikipedia editor- 4 days to complete! -- 2

I have a project to edit an existing Wikipedia page that needs contributions due to it being a start class. I need to determine what needs to be added to the article that is being improved.
A range of more than 300-400 words need to be contributed to the Wikipedia article that you are improving
The main task is to determine what is missing from the article and add missing but relevant findings from the research. In order to edit the Wikipedia article I chose to improve , I need to identify reliable sources.
Also the sources needs to follow Wikipedia’s rule that every statement can easily be associated with a supporting reference.