Lau, Charles Q, Alexandra Cronberg, Leenisha Marks, and Ashley Amaya. “In Search of the Optimal Mode for Mobile Phone Surveys in Developing Countries. A Comparison of IVR, SMS, and CATI in Nigeria”. Survey Research Methods 13, no. 3 (December 10, 2019): 305–318. Accessed April 19, 2024. https://ojs.ub.uni-konstanz.de/srm/article/view/7375.