Yabiku, Scott, Jennifer Glick, Elizabeth Wentz, Dirgha Ghimire, and Qunshan Zhao. “Comparing Paper and Tablet Modes of Retrospective Activity Space Data Collection”. Survey Research Methods 11, no. 3 (October 20, 2017): 329–344. Accessed April 27, 2024. https://ojs.ub.uni-konstanz.de/srm/article/view/6741.