This probably also could go to English.SE, but I'm not sure.
When I want to cite a source for a complete sentence, you put the citation before or after the period?
And if you cite for a word, or figure, do you put it before or after the comma?
Please bear in mind my citations are not superscripted, here's an example:
appropriate awards and punishments[4, p.415].
appropriate awards and punishments.[4, p.415]
when, on January 28[3, p.4],
when, on January 28,[3, p.4]
I have a feeling that for facts I should put it right behind the fact and before the comma, while for sentences it should be after the period, but I do not know for sure.
Until now, I have never spotted non-superscript citation marks after a comma or period. In addition, the marks should be separated by a normal interword space or a non-breaking space, i.e.
See page 2 of this PracTeX Journal article for another example.