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a systematic map protocol (Methods (Literature (Secondary Literature (the…

- - - - the majority of sources in a literature review are secondary sources that present research findings, analysis, and the evaluation of other researcher's works.
        
        Bibliographies [also considered tertiary]
        
        Biographical works
        
        Books, other than fiction and autobiography
        
        Commentaries, criticisms
        
        Dictionaries, Encyclopedias [also considered tertiary]
        
        Histories
        
        Journal articles [depending on the disciple can be primary]
        
        Magazine and newspaper articles [this distinction varies by discipline]
        
        Textbooks [also considered tertiary]
        
        Web site also considered primary]
    - - historical manuscripts.
        parliamentary debates and papers.
        Bills, Acts and Explanatory Memoranda.
        old magazine and newspaper articles.
        speeches and interviews.
        letters, diaries, memoirs and autobiographies.
        audio recordings.
        unpublished lab notes.
    - - The term grey literature refers to research that is either unpublished or has been published in non-commercial form. Examples of grey literature include:
        government reports
        policy statements and issues papers.
        conference proceedings.
        pre-prints and post-prints of articles.
        theses and dissertations.
        research reports.
        geological and geophysical surveys.
        maps.
        newsletters and bulletins.
        fact sheets.