William Wells (2007), a professor of advertising department at the university of Minnesota, discusses the related contents of periodical advertisements such as the establishment of journals, measurement of their readers, categories, technology, layout, advantages and disadvantages, raising that advertising in the magazine has many advantages, like easy contact to the target audience, high acceptance, long life cycle, good communication effect etc. 《时代周刊》的广告经营研究(3):http://www.youerw.com/yingyu/lunwen_28507.html