1. VIII War Deafness and its Prevention
2. ACOUSTIC TRAUMA IN MAN: CLINICAL AND EXPERIMENTAL STUDIES
3. Miller D. C.: Sound Waves, Their Shape and Speed, New York, MacMillan Co., 1937, p. 113.
4. Richardson E. G.: Sound, 2nd Ed. London, Edward Arnold & Co., 1929, vol. 1, p. 27.