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Primary sources are also sets of data, such as health statistics, which have been tabulated, but not interpreted. 1  Journals or Periodicals: main type of publication in which scientific research is reported. 2  May be published by learned societies or by commercial publishers. 3  A researcher(s) submits an article to a journal.
Primary sources may include but are not limited to: letters, manuscripts, diaries, journals, newspapers, maps, speeches, interviews, documents produced by government agencies, photographs, audio or video recordings, born-digital items (e.g. emails), research data, and objects or artifacts (such as works of art or ancient roads, buildings, tools, and weapons).