i dont actually know what the harvard style is, but im guessing that in typical ivy-league fashion it's some half-arsed imitation of our classical english unis. so...
Harvard referencing is used in England as well. It's nothing to do with the Harvard college I think, it's just the name of a referencing style.
As far as I recall, the method is (Author's Last Name, year) next to the statement requiring citation, then at the end you write a reference list, in alphabetical order, of (Name, Title of Publication, year, volume, pages).
For hyperlinks it's just (Name, Title, date, hyperlink)