Lau, C. Q., Cronberg, A., Marks, L., & Amaya, A. (2019). 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(3), 305-318. https://doi.org/10.18148/srm/2019.v13i3.7375