Paul the most common method, quoting doctors and professors. This strategy helps the reader side with the author more. When higher positions such as doctors, scientists, and professors back up an argument, people tend to lean more towards their side.For instance, we will believe a diagnoses from our doctors before we believe a diagnoses from a school nurse. It's not that our nurse is wrong or knows any less; it's simply because our doctors are in a higher position.
Paul also uses an ethos appeal. Authors appeal to ethos when they touch with our emotions and everyday life. For example,