Peer-reviewed:
Periodicals = Journals + Magazines
Journals report original research and can be recognized by their scientific writing style. Articles tend to be long and include bibliographies. The author(s) and title appear prominently on the article's first page. Their content is aimed at the scholarly community. Articles are peer-reviewed and of high academic and scientific standards.
Magazines cater to popular opinion and interest. They are easy to read, shorter in length, attractive and informative. They are not necessarily written by experts and are not peer-reviewed. Time, Newsweek, Science and Nature are examples of magazines that are accepted as authoritative, but they are not subjected to a strict pre-publication viewing process. Use these with caution when writing assignments.