Pepper, D;    Hodgen, J;    Lamesoo, K;    Kõiv, P;    Tolboom, J;      (2018)    Think aloud: using cognitive interviewing to validate the PISA assessment of student self-efficacy in mathematics.                   International Journal of Research and Method in Education , 41  (1)   pp. 3-16.    10.1080/1743727X.2016.1238891 <https://doi.org/10.1080/1743727X.2016.1238891>.       Green open access