Hopefully these don't seem too critical.
You could possibly use "include" instead of "are" in the first paragraph to be more specific.
I'm not sure how the professor wanted you to cite things, but usually I leave just the author name and year of publication in the body of the text, leaving the full document summary on the last page in a "works cited". Here is a link for MLA format if you need it:
http://www.hcc.hawaii.edu/education/...ry/mlahcc.html
You might want to remove the last sentence in the second paragraph - it goes without saying that if the article was published it recieved close peer-reviewed scrutiny. Also again in the third paragraph. You might just want summarize the key points in your paragraph to end them