Q. How can I find an article pertaining to the persuasion technique of authority?
Without knowing the detail of your question about "the persuasion technique of authority," I am going to answer it at face value.
To find articles: From the library main page, click on Databases by Topic, then click on Communication. You are now at the Research Guide page on Communication. From here, you can click on a recommended database such as "Communication & Mass Media Complete."
Once you get to the database, you can search for terms such as "persuasion" AND "authority." You'll then have to evaluate the results and see if they fit your search criteria. Ways to narrow or expand your search include looking at the keyword/thesaurus terms and the subject heading that the search result suggests.