Harvard and zetero outputs

Here's a question I never considered and wondered how it related to how Zetero.

If I cite multiple authors (separate documents not multiple authors on the same document), what does Harvard say about the correct way to order them?

should it be:

(Anderson 2001; Blocks 1999; Williams 1956)?

If so, why when selecting multiple authors does Zetero not order them as such? or is it simply that Harvard says nothing about the matter?
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