1. Bleyer, U., Gottloeber, S., Haubold, H.J., Hempelmann, A., Muecket, J.P., Mueller, V., & Stoll, D. (1979). Zur Geschichte der Theorie der Lichtausbreitung. Die Sterne, 55, 21-40.
2. Born, M. (2005). The Born-Einstein Letters 1916-1955: Friendship, Politics and Physics in Uncertain Times. Macmillan.
3. Georg Joos’ Experimentum Crucis in Jena 1930 and the Fall of the Ethereal Aether
4. Helmholtz and the shaping of the American physics elite in the Gilded Age
5. Michelson–Morley Experiments