Scholarly sources, which are normally published in journals, as book chapters, or in conference proceedings, usually cover specific topics at a fairly deep level.
Magazines that are focused on an industry have a wealth of information. These are "trade" periodicals, and include articles typically written by professionals in an industry - and the audience is other professionals in that industry. They often report on trends, relevant events, and on company news in an industry. And, they summarize recent research. Also - a cover story provides a great starting point.
