13 - Footnotes

The number (1, 2, ... n) or sign (*) indicating a footnote comes after the full stop at the end of the sentence.  It is also quite rare in English to put a footnote reference in the middle of the sentence.

...as the author's point out in her major biography.1

1. Fraser, A., Cromwell: Our Chief of Men.

NB: the numbers and signs are in small, raised characters!