PRIMARY SOURCES: Speeches, Technical reports (originals), Websites (original content), Government documents (reports, bills,etc.), Patents, Audio recordings, DVDs and video recordings (original), Interviews, surveys, and fieldwork, Research data, Blogs (personal and original reflections), Photographs and drawings, Artifacts of all kinds, Public opinion polls, Official and unofficial records of government and government agencies, Works of art and literature, Autobiographies and memoirs, Original documents (birth certificates, property deeds, etc.), Diaries, personal letters, and correspondence, Scientific journal articles reporting experimental research, Books, magazines, and newspaper articles published at that time, SECONDARY SOURCES: Literature reviews and review articles, Articles from magazines, journals, and news reports after the event, Commentaries, Textbooks, History books and other popular or scholarly books, Reference books like dictionaries, encyclopedias, etc., Works of criticism and interpretation, Biographies,

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