The following reference is by Emer de Vattel (April 25, 1714 - December 28, 1767). He was a Swiss philosopher, diplomat, and legal expert whose theories laid the foundation of modern international law and political philosophy. He is most famous for his 1758 work, "The Law of Nations or the Principles of Natural Law Applied to the Conduct and to the Affairs of Nations and of Sovereigns." This work was his claim to fame and won him enough prestige to be appointed as a councilor to the court of King Augustus III of Saxony.
From p. 183 of "The Law of Nations":
NOTE the words "born", "parents" and "citizens".
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Now here's a copy of the famous letter from John Jay to George Washington during the Constitutional Convention where he suggests the President be a natural born Citizen.
Notice how John Jay has Underlined the word "born". On the Constitutional drafts, he underlines born" in nearly all instances.
