2) Levarie, Siegmund and Levy, Ernst. Tone: A Study in Musical Acoustics. Oberlin Printing Co. 1968.
3) Olson, Harry F. Musical Engineering. McGraw-Hill Book Co. 1952.
4) Taylor, C.A. The Physics of Musical Sounds. American Elsevier Publishing Co., Inc. 1965.
5) Wood, Alexander. The Physics of Music. Chapman and Hall Ltd. 1975.