Usually one would use either footnotes or endnotes for this. If you do not
like the default footnote format, it's still easier to use the
numbering/re-numbering function of footnotes and change the formatting.
Start here for ways to make that easier:

"I want the numbers in my footnotes not to be superscripted, and I want the
numbers to be followed by a dot and a tab"
http://word.mvps.org/FAQs/MacrosVBA/UnSuperscptFnotes.htm

Actually, let me take that back. Cross-references to a numbered list at the
end will probably suit you just fine, and Word will update those with other
fields.