articles in professional journals, monographs, doctoral theses, interviews and questionairesoriginal works ( letters, diaries, eyewitness accounts, poems, novels, autobiographies) and reports (proceedings of Parliament, court testimony, reports of governmnent departments and agencies, annual reports, minutes)secondary source of information are summaries of information gathered from primary sources. these include translations, summaries and reviews of research ( for example, encyclopedia articles), abstracts, guide books and other publications containing information, commentaries, and so on
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