Shamon, Hawal, and Carl Clemens Berning. “Attention Check Items and Instructions in Online Surveys With Incentivized and Non-Incentivized Samples: Boon or Bane for Data Quality?”. Survey Research Methods 14, no. 1 (April 10, 2020): 55–77. Accessed May 6, 2024. https://ojs.ub.uni-konstanz.de/srm/article/view/7374.