Your instructor may require you to use scholarly or peer-reviewed sources. Scholarly sources are written by experts in a particular field. They cite their sources through footnotes and bibliographies. Non-scholarly sources are works which are considered popular or more for entertainment than serious research.
Your instructor may require that you not use "popular" or non-scholarly works in your research. Which of these would be considered "popular" and which is "scholarly"?
People Magazine
The Journal of American History
