Dobbins, P.A., and S.M. Douglas. “Electroacoustical and Real-Ear Comparisons of Assistive Listening Devices”. Canadian Acoustics 19, no. 4 (September 1, 1991): 79–80. Accessed July 1, 2022. https://jcaa.caa-aca.ca/index.php/jcaa/article/view/678.