[12] Bowers, C. G., The Young Jefferson, New York, 1945.
[13] Brocklesby, R., Reflections on Antient and Modern Musick, London, 1749.
[14] Bücher, K., Arbeit und Rhythmus, in Diserens, C. M.
[15] Burney, Charles, A General History of Music, Ed., by Mercer, F., New York, 1937.
[16] Celsus, A. C., Of Medicine, Trans. by J. Grieve, London, 1838.
[17] Champlain, Voyages de l’Amerique, in Roger, J. L.
[18] Chomet, H., Influence of Music in Health and Life, New York, 1875.
[19] Combarieu, J., La Musique, Ses Lois, Son Evolution, Paris, 1907.
[20] Damon, K. F., Program Notes for the Listener to music, New York, 1933.
[21] Densmore, Frances, American Indians and Their Music, New York, 1926.