1. Helmholtz, H., “Popular Lectures”, p. 249 (London, 1873).
2. Wood, A., “Thomas Young, Natural Philosopher, 1773–1829”, completed by F. Oldham (Cambridge, 1954).
3. Försterling, K., “Lehrbuch der Optik” (Leipzig, 1928). Sommerfeld, A., “Vorlesungen über theoretische Physik”, 4, Optik (Wiesbaden, 1950). Laue, M. v., “Handb. d. Exper. Phys.”, 18, 211 (Akad. Verlagsges., Leipzig, 1928).
4. Rubinowicz, A., “Die Beugungswelle in der Kirchhoffschen Theorie der Beugung” (Państwowe Wydawnictwo Naukowe, Warszawa) (in the press).
5. Young, Th., “Miscellaneous Works of the late Thomas Young”, 1 (London, 1855).