1. IEC 60076-6 (2007): power transformers – part 6: reactors.
2. IEC 60076-10 (2005): power transformers – part 10: determination of sound levels.
3. Hambric, S. A. (2006): Structural acoustics tutorial – part 1: vibrations in structures. Acoustics Today, 2(4), 21–33.
4. Kinsler, L. E., Frey, A. R., Coppens, A. B., Sanders, J. V. (1982): Fundamentals of acoustics. New York: Wiley.