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Assuming you're not following any specific style manual, citations can go pretty much anywhere except for the abstract and the conclusions/final statements. The idea is that the abstract should b...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/48792 License name: CC BY-SA 4.0 License URL: https://creativecommons.org/licenses/by-sa/4.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/48792 License name: CC BY-SA 4.0 License URL: https://creativecommons.org/licenses/by-sa/4.0/
#2: Initial revision
Assuming you're not following any specific style manual, citations can go pretty much anywhere **except for the abstract and the conclusions/final statements.** The idea is that the abstract should be a short summary of your document, so any citation is essentialy wasted space. The conclusions should follow naturally from the research you've done, so, again, it doesn't make much sense including citations; you're supposed to write something new or at least specific to your study. Of course citations mostly belong to the literature review section, but they should be fine anywhere else too. My sources are my own limited experience in writing theses, PhD proposals and reading scientific articles.