Add your citations normally to the document and when the References section is created for you at the bottom of the document, select how you want to sort the references:
in order of appearance
by date

The sorting will apply also to the exported document unless you are using a custom vendor style.

Advanced options.
If you are having trouble sorting your citations in the exported document, you can pick a different Citation Style in the Export Options.

Sort alphabetically
apacite (bibtex) if you would like a natural APA-looking citation of the form "Rodriguez (2011)"
alpha (bibtex) if you'd like a citation of the form "[Rod11]"
plain (bibtex) if you would like a numbered citation of the form "[1]"

Sort by date
plainyr if you would like a simple sorting by date
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