1. AIP. Home movies of William F. Meggers, from of a meeting of 21 August 1927 with Heinrich Kayser at the Physics Institute in Bonn. American Institute of Physics, College Park, Maryland (also accessible online).
2. Dörries, Matthias. “Heinrich Kayser as Philologist of Nature.” Historical Studies in the Physical Sciences 26 (1997): 1–33.
3. Gerlach, Walther: “Kayser, Heinrich.” Neue Deutsche Biografie. Berlin: Duncker & Humblot, 11 (1977): 381–382.
4. Hentschel, Klaus: Zum Zusammenspiel von Experiment, Instrument und Theoriebildung. Hamburg: Kovač, 1998, esp. chaps. 5–6.
5. — Mapping the Spectrum. Techniques of Visual Representation in Research and Teaching. Oxford: Oxford University Press, 2002, esp. chap. 8.