Smyth, Jolene, Kristen Olson, and Alian Kasabian. “The Effect of Answering in a Preferred Versus a Non-Preferred Survey Mode on Measurement”. Survey Research Methods 8, no. 3 (December 10, 2014): 137–152. Accessed April 18, 2024. https://ojs.ub.uni-konstanz.de/srm/article/view/5750.