Chung, D. Y., Hardie, R. and 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), p. 45. Available at: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/504 (Accessed: 4 May 2024).