Chung, D. Y., Hardie, R., & Gannon, R. P. (1983). Letter to the Editor: The Effect of Hair, Glasses, or Cap on the Performance of One Pair of Bilsom Viking Circumaural Hearing Protectors. Canadian Acoustics, 11(2), 45. Retrieved from https://jcaa.caa-aca.ca/index.php/jcaa/article/view/504