Your source Jill Pryor just created one out of the thin air over Yale Law School:
"As historical and textual analysis has shown, a citizen may be both "naturalized" and "natural born." Under the naturalized born approach, any person with a right to American citizenship under the Constitution, laws, or treaties of the United States at the time of his or her birth is a natural-born citizen for purposes of presidential eligibility."
What, in God's name, is a naturalized born citizen???? Are you guys for real???
Pryor wasn’t my source. Seems like she’s a bit “out there” (something I did not know earlier, until I read her piece), but she does have some decent-looking primary source materials in her articles/footnotes. I wouldn’t trust a damn thing she says, in other words, but her paper may be a good jumping-off-point for further research.