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In the Sciences, primary sources are documents that provide full description of the original research. For example, a primary source would be a journal article where scientists describe their research on the human immune system. A secondary source would be an article commenting or analyzing the scientists' research on the human immune system.
Examples of Primary and Secondary Sources
Primary and Secondary Source Examples
Criticism and interpretation
Law and Legislation
Moral and Ethical Aspects
Studies or Surveys
Source: The Evolution of Scientific Information (from Encyclopedia of Library and Information Science, vol. 26).