Scholarly or Academic sources:
Their purpose is to share information within the subject field and they are based on original research and experimentation. They are suitable for academics, and are supported by a system of learning and study. They are less widely circulated than popular sources and may be understandable only to those who work or study in a particular field. In addition, scholarly sources are juried either through peer review or the referee process.
Examples: New England Journal of Medicine, Modern Fiction Studies, Journal of Modern History, American Journal of Political Science.
Popular sources: are widely available, usually cheaper to acquire, and can be understood by almost every person with basic literacy skills. They tend to promulgate known ideas and theories. These works may be professionally edited, but do not go through a jury process.
Examples: Time, Newsweek, Sport's Illustrated, People
Trade: Neither scholarly or popular sources, but could be a combination of both. Allows practitioners in specific industries to share market and production information that improves their businesses.
Examples: Interior Design, Aviation Week, Progressive Farmer, Pharmacy Times
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