(EN) L. E. J. Brouwer, Collected Works: Philosophy and Foundations of Mathematics. Edited by A. Heyting, North-Holland, 1975, p. 565. URL consultato l'11 marzo 2023.
«It expresses a philosophical position which he held all his life. In ( 1948 C) he defended similar ideas. The introduction of (1908 C) can only be understood on this basis ; this proves that according to Brouwer himself there was a narrow connection between his general philosophical ideas and his philosophy of mathematics and science. For this reason we must give some attention to the pamphlet, but printing an integral translation is out of the question. In many places Brouwer runs on inconsiderately, for instance on the position of women in society, and these digressions have nothing to do with his fundamental ideas.»
