Joyce T, Remler DK, Jaeger DA, Altindag O, O’Connell SD, Crockett S. On Measuring and Reducing Selection Bias With a Quasi‐Doubly Randomized Preference Trial. Journal of Policy Analysis and Management. 2017 Mar;36(2):438-59. https://doi.org/10.1002/pam.21976

Ted Joyce, Sean Crockett, David A. Jaeger, Onur Altindag, Stephen D. O’Connell, Does classroom time matter?, Economics of Education Review, Volume 46, 2015, Pages 64-77, ISSN 0272-7757, https://doi.org/10.1016/j.econedurev.2015.02.007