Some studies cited in a literature review may be decades old.The researcher may decide to use studies from this far back because these studies

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Studies that are groundbreaking or landmark studies are those that were significant to the development of knowledge on the topic being reviewed.In this case,it is appropriate to cite these studies,even if they are very old.Well-written,peer-reviewed studies that are not current are generally not used in a literature review.Studies that are decades old,however well-written and relevant,are not current studies,but are used for historical or seminal context.

Some Studies Cited in a Literature Review May Be Decades