ABI/INFORM is a comprehensive database of articles from key trade publications, scholarly journals, conference proceedings, market reports, etc.
Business Source Complete is a comprehensive database of articles from scholarly and trade journals, working papers, as well as market reports and industry reports.
Academic articles, also referred to as a journal or research articles, is often the most common type of source used in academic research. These articles can be peer-reviewed, but are not always.
Trade articles come from trade publications, and while they may be scientific, they are geared specifically toward people or businesses in a certain industry. These articles are a great way to learn more about the happenings of an industry, but are not considered academic sources.
Popular articles come from magazines or newspapers and are not scientific. They may report on new research developments or provide current perspectives on topics.