Abel, S. M., P. W. Alberti, and K. Riko. “Speech Intelligibility in Noise With Ear Protectors”. Canadian Acoustics 9, no. 3 (July 1, 1981): 40–49. Accessed April 19, 2024. https://jcaa.caa-aca.ca/index.php/jcaa/article/view/467.