To check to see if an article is from an authoritative source, you can do several things.
1) check the author's credentials: Go into Scopus, click on Authors and locate the author in question, Is this their first published article, or have they been published many time in reputable publications? Scopus is a major biomedical database. The link to it can be found on the library webpage (right underneath PubMed) or try this link: https://www-scopus-com.ezproxy.rush.edu/search/form.uri?display=basic
2) Check the publication: Go into Ulrich's, locate the publication, and see if it is peer-reviewed (refereed).