I have a table of studies and formula per study in the appendix, so sth like
study A E = mc²
study B v = ma
etc. For each study I need to cite a source. Now normally the citation list for the main part of document appears before the appendix. How do I handle this? Do I create a new citation list after the table?
For a PhD thesis (as indicated in the tags of your question), check your university's reference style guide. I suspect, however, that it doesn't go into that much detail. So: do what you like best, as long as it's clear and coherent.
If you have many citations in the appendix, and you suspect that people will want to read the appendix and main document separately, just maintain two separate lists of citations. It makes each of them shorter, and thus easier to read.
If you have very few citations in the appendix, you can also consider citing them in a different style, such as footnotes. It keeps them separated from the main references, for clarity, but doesn't necessitate to have a full “appendix list of references” if it's very short.
Depends on where your appendix falls in your document (or whether it will appear in the document at all). If appendix precedes references, just include citations in the regular reference list. If it follows, have a separate set of appendix-specific references. If it is separate, do the same as the latter case (a separate reference list).
This will depend on your style manual and publication outlet.
