Chung, D. Y., R. Hardie, and R. P. Gannon. “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, no. 2 (April 1, 1983): 45. Accessed October 4, 2024. https://jcaa.caa-aca.ca/index.php/jcaa/article/view/504.