If the in-text reference concerns only one sentence, the reference is included within that sentence. Thus, the full stop is marked outside of the brackets. An example of a case where the in-text reference concerns only one sentence:
If the in-text reference concerns more than one sentence, the in-text reference is marked in brackets after the last full stop of these sentences, almost as if the in-text reference is a sentence of its own. In this case a full stop is also included last inside the brackets. An example of a case where the in-text reference concerns more than one sentence:
Same example as above, now referring to multiple pages, with page numbers separated by commas.