Source: 1940s, Economic Analysis, 1941, p. xv
“The present book is not a methodology of mathematics in the sense that I will systematically show how some teaching matter should taught; it is not even a systematic analysis of subject matter. I hardly ever refer to well-organized classroom experiments evaluated by statistical methods, nor do I cite experimental results of developmental psychology or the psychology of learning. Maybe the most striking feature is that this book contains few quotations. I will try to justify all these features.”
Source: Mathematics as an Educational Task (1973), p. v;As cited in: Ben Wilbrink (2013)
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Hans Freudenthal 27
Dutch mathematician 1905–1990Related quotes

Source: A History of Experimental Psychology, 1929, p. ix; As cited in: Baldwin R. Hergenhahn (2008). An Introduction to the History of Psychology. p. 5
Source: "Attribution theory in social psychology." 1967, p. 192

As quoted in Carl Friedrich Gauss: Titan of Science (1955) by Guy Waldo Dunnington. p. 306

Great Books: The Foundation of a Liberal Education (1954)

1980s, 1984 letter to Encyclopedia Judaica
Source: from 1st paragraph, verified page 137 of "White King and Red Queen: How the Cold War was Fought on the Chessboard" by Daniel Johnson, published 2008 https://books.google.ca/books?id=7Lzd7SaQA_YC&pg=PA137
General System Theory (1968), 4. Advances in General Systems Theory
Kurt Danziger, "Wundt's psychological experiment in the light of his philosophy of science." Psychological Research 42.1-2 (1980). p. 109; Summary

Hypnotism (1945) by Axel Wayne Bacon. In the Preface to the 1960 edition, Nelson-Hall Co., Publishers