1. H. Bagot, “The bell – Where do we stand today?,” Invited paper in the Fifth International Congress on Sound and Vibration – 1997, Adelaide, South Australia.
2. Chladni's law and the modern English church bell
3. D. J. Ewins, Modal Testing: Theory, Practice, and Application (Research Studies Publisher, 2000)
4. Partial Frequencies and Chladni’s Law in Church Bells