Simply re-saving in the docx format a document that had been saved in the doc format won't restore the citations & bibliography - they'll have been converted to static text and will now have to be recreated. Thankfully, though, when you create a reference entry, Word stores a copy in another file, so you won't have to recreate the actual references; you can simply copy them from the master list back into your document.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]