1. R. D. Hudson, Jr.: Infrared System Engineering (Wiley-Interscience, 1969). Refered to old history
2. G. Laski: “Ultrarotforschung,” Ergeb. Exakt. Naturwiss. 3, 86−115 (1924).
3. E. D. Palik: “A far infrared bibliography,” in K. D. Möller and W. R. Rothschild, Far Infrared Spectroscopy (Wiley-Interscience, 1971), Appendix VII, 679−759. In the article, Palik presents a chronological list of 1512 papers related to FIR Spectroscopy published between 1892 and 1969.
4. Geiger-Scheel (Eds.): Handbuch der Physik 19 (1928), Kap. 26, Besondere Methoden der Spektroskopie. a) G. Laski: “Spezielle Messmethodik im Ultrarot,”802. Detailed description of IR spectroscopy in Rubens era b) Th. Dreisch: “Messung der Energieverteilung im Spektrum und der Gesamtenergie,” 829 Detailed description of detectors
5. C. Schaefer and F. Matossi: Das Ultrarotspektrum (Springer, Berlin ,1930). At the same time, the following two books were published: J. Lecomte: Le Spectre Infrarouge (les Presses Univers, Taives de France, Paris 1928). Lecomte was a key researcher in IR studies after World War II. A. Hadni was his successor. F. I. G. Rawlins and A. M. Tayler: Infrared Analysis of Molecular Structure Cambridge Univ. Press (1929).