1. Scholarly articles are written by professionals in the field
-- authors are subject matter experts, the information and data has been researched & reviewed
2. Non-scholarly articles are written in popular magazines
-- information is not researched
-- articles are often biased and based on opinions
3. Trade publications cover business trends, new products or techniques, and organizational news
-- written by staff or contributing authors
Example: Physics Today
4. Primary Sources are original documents or records of events described by someone who participated or witnessed the events. For example: government census, historical documents, statistical data, or manuscripts.
5. Secondary Sources are works that have been analyzed, an interpretation or review of the original work. For example: reviews, monographs, handbooks or literary criticisms.