1. Planck, M. (1900). Zur theorie des gesetzes der energieverteilung im normalspectrum. Verhandl. Dtsch. Phys. Ges., 2, 237–245.
2. Longair, M. S. (1984).Theoretical Concepts in Physics: An Alternative View of Theoretical Reasoning in Physics. Cambridge University Press.
3. Slater, J. C. (1969). Concepts and Development of Quantum Physics. Dover Publications.
4. Strickland, J. (2011). Weird Scientists—the Creators of Quantum Physics. Lulu.com.
5. Chang, D. C. (2017). Physical interpretation of the Planck’s constant based on the Maxwell theory. Chinese Physics B, 26, 040301.