Peytchev, Andy, and Emilia Peytcheva. “Reduction of Measurement Error Due to Survey Length: Evaluation of the Split Questionnaire Design Approach”. Survey Research Methods 11, no. 4 (December 13, 2017): 361–368. Accessed April 19, 2024. https://ojs.ub.uni-konstanz.de/srm/article/view/7145.