To set themselves apart, columnists for print and online publications establish a viewpoint and style. The types of sources they use and the way they use them are part of that style. Using three columns by one writer, analyze the columnist’s audience by examining the type of sources he or she uses. For your columnist, you might consider a political commentator from a national or local publication, a sportswriter, a movie or music reviewer, a professional blogger, or even an amateur blogger.