1. Curt Sachs, The History of Musical Instruments, c2006, Dover Edition, originally published in 1940 by W.W. Norton, NY.
2. Natalie West and Gordon Ramsey, “Physics of the French horn”, Proc. Mtgs. Acoust. 42, 035003 (2020); https://doi.org/10.1121/2.0001352 and references contained within.
3. Arthur H. Benade, Horns, Strings and Harmony, 1960, 1988, 1992 by Virginia Benade, and c1992, Dover Edition, Dover publications, NY.
4. Donald E. Hall, Musical Acoustics, c 2002, Brooks/Cole, Pacific Grove, CA.
5. Henri Boutin, John Smith, Joe Wolfe, J Acoust Sci Am, 147 (2020), https://doi.org/10.1121/10.0001466.