Ahmed, Shazia, Sina Fallah, Brenda Garrido, Andrew Gross, Matthew King, Timothy Morrish, Desiree Pereira, Shaun Sharma, Ewelina Zaszewska, and Kathy Pichora-Fuller. 2007. “Use of Portable Audio Devices by University Students”. Canadian Acoustics 35 (1):35-52. https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1870.