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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.
Historians use primary sources as the raw evidence to analyze and interpret the past. They publish secondary sources - often scholarly articles or books - that explain their interpretation. When you write a historical research paper, you are creating a secondary source based on your own analysis of primary source material. Examples of primary sources include diaries, journals, speeches, interviews, letters, memos, photographs, videos, public opinion polls, and government records, among many other things.