Piercy, J. E., and T. F.W. Embleton. “Noise Testing of Vehicles - Acoustic Propagation Phenomena”. Canadian Acoustics 8, no. 4 (October 1, 1980): 29–35. Accessed November 22, 2024. https://jcaa.caa-aca.ca/index.php/jcaa/article/view/448.