1. N. Bohr, Atomic Theory and the Description of Nature (Cambridge University Press, Cambridge, 1934), p. 1.
2. N. Bohr, Atomic Theory and the Description of Nature (Cambridge University Press, Cambridge, 1934), p. 1.
3. N. Bohr, Atomic Theory and the Description of Nature (Cambridge University Press, Cambridge, 1934), p. 18.
4. N. Bohr, Atomic Physics and Human Knowledge (Wiley, New York, 1958), p. 90.
5. N. Bohr, Essays 1958/1962 on Atomic Physics and Human Knowledge (Wiley, New York, 1963), p. 60.