How many papers are in a systematic review?
There is no limitation in terms of number of included studies, however, while publishing your review in the journals, they might apply subjective criteria and publish the systematic reviews with more than one included studies.
How far back should a literature review go?
How does related literature contribute to one’s study?
Provide foundation of knowledge on topic. Identify areas of prior scholarship to prevent duplication and give credit to other researchers. Identify inconstancies: gaps in research, conflicts in previous studies, open questions left from other research. Identify need for additional research (justifying your research)
What are the sources of literature review?
The Literature This includes peer-reviewed articles, books, dissertations and conference papers. When reviewing the literature, be sure to include major works as well as studies that respond to major works. You will want to focus on primary sources, though secondary sources can be valuable as well.