Any references you added to the original Word document will have been stored in that as well as in a master list that will now be available to all documents. Simply going into References>Manage sources will open up the Source Manager, allowing you to copy sources from the 'Master list' to the active document's 'Current list'.

Alternatively, you could make a copy of your existing document, then just delete whatever content you don't want - all the sources will remain.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]