EwaldW
Ewald, William, "The Emergence of First-Order Logic", The Stanford Encyclopedia of Philosophy (Spring 2019 Edition), Edward N. Zalta (ed.), URL = <https://plato.stanford.edu/archives/spr2019/entries/logic-firstorder-emergence/>.
Ewald, William, "The Emergence of First-Order Logic", The Stanford Encyclopedia of Philosophy (Spring 2019 Edition), Edward N. Zalta (ed.), URL = <https://plato.stanford.edu/archives/spr2019/entries/logic-firstorder-emergence/>.