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Wikipedia articles must not contain original research.The phrase original research (OR) is used on Wikipedia to refer to material—such as facts, allegations, and ideas—for which no reliable, published sources exist. This includes any analysis or synthesis of published material that serves to reach or imply a conclusion not stated by the sources.EVALUATING HISTORICAL SOURCES Historians most often use written sources, but audio and visual materials as well as artifacts have become important objects that supply information to …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.Using Primary Sources : The detective investigates a crime that was committed in the past. He looks for evidence such as fingerprints or witnesses or articles that link the suspect and the crime.Scientific literature is divided into two basic categories - primary and secondary. A Primary Source is a document or physical object which was written or created during the time under study and is the result of original scientific research or observation. Some types of primary sources include: SCHOLARLY JOURNAL ARTICLES: An article reporting new and original research or findings written ...Primary and secondary sources. The numerous existing energy sources can be classified in different ways. Primary sources can be used directly, as they appear in the natural environment: coal, oil, natural gas and wood, nuclear fuels (uranium), the sun, the wind, tides, mountain lakes, the rivers (from which hydroelectric energy can be obtained) and the Earth heat that supplies geothermal energy.Sources of information are often considered primary, secondary, or tertiary depending on their originality and proximity of when it was created.Primary and secondary sources form the cornerstones of historical research. A modern-day work of history is is essentially a description and interpretation of primary sources, along with commentary of secondary sources, both using them in reference to the subject matter at hand, and agreeing and disagreeing with them.Proposed policy change to WP:NOR Primary, secondary, and tertiary sources. All articles should rely on reliable, third-party published sources with a reputation for fact-checking and accuracy.primary sources secondary sources