1. The years as provided in the references indicate respectively the 1st edition/the last updated edition/the edition used by the author.
2. Ahlfors, L. V. (1962). On the mathematics curriculum of the high school. American Mathematical Monthly, 69, 425–426 (The Memorandum was signed by 65 mathematicians, among them Wittenberg, Polya, Kline, Weyl, etc.).
3. Aristotle. (1930). The works of Aristotle. In W. D. Ross (Ed.), Organon and other collected works. Oxford: Oxford University Press.
4. Armstrong, H. E. (1934). The first Frankland memorial oration. The lancastrian Frankland society. Journal of the Society of Chemical Industry 53/21.
5. Binet, A. (1911/1975). Modern ideas about children. Albi: Suzanne Heisler.