Billie Said:

When writing an Argumentive Essay is it mandatory to use information or sources?

We Answered:

Using sources adds a great deal of ethos (credibility) to your character. Do you know about the rhetorical appeals (logos, pathos, ethos)? Giving concrete evidence helps with all of these categories.

Furthermore, try to use books and academic medical journals instead of mostly using sources on the Internet. Just remember to cite your sources. Hope this helps!