Kurt Gödel. Zur intuitionistischen Arithmetik und Zahlentheorie (1933e). A reprint of 41811. Collected Works, Volume I, Publications 1929– 1936, by Kurt Gödel, edited by Solomon Feferman, John W. DawsonJr., Stephen C. Kleene, Gregory H. Moore, Robert M. Solovay, and Jean van Heijenoort, Clarendon Press, Oxford University Press, New York and Oxford1986, even pp. 286– 294. - Kurt Gödel. On intuitionistic arithmetic and number theory (1933e). English translation by Stefan Bauer-Mengelberg and Jean van Heijenoort of the preceding. Collected Works, Volume I, Publications 1929– 1936, by Kurt Gödel, edited by Solomon Feferman, John W. DawsonJr., Stephen C. Kleene, Gregory H. Moore, Robert M. Solovay, and Jean van Heijenoort, Clarendon Press, Oxford University Press, New York and Oxford1986, odd pp. 287– 295. - A. S. Troelstra. Introductory note to 1933e. Collected Works, Volume I, Publications 1929– 1936, by Kurt Gödel, edited by Solomon Feferman, John W. DawsonJr., Stephen C. Kleene, Gregory H. Moore, Robert M. Solovay, and Jean van Heijenoort, Clarendon Press, Oxford University Press, New York and Oxford1986, pp. 282– 287