Best style for a scientific paper?

answers1: Just look at the journal and copy their style. If it's a
report for class, select any peer-reviewed journal in the field.
answers2: If you're submitting it to a journal, they all have their
own styles. That information is under 'information for authors' on
the journal website. Often you have to completely reformat your paper
to send it to a different journal. And many use LaTeX, which you
would need to learn before submitting a paper to a journal. But if
it's just a paper for a class and they didn't specify which style to
use, it's up to you - MLA, Harvard, Chicago, etc.