Foreman, J. K., S. M. Dickinson, and M. A. Emmerson. “Noise Level/Attitudinal Surveys of London & Woodstock, Ontario”. Canadian Acoustics, vol. 3, no. 4, Oct. 1975, pp. 7-12, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/381.