Referens:
Coe, Robert and Gabriel Heller Sahlgren (2014),
"Incentives and Iignorance in Qualifications, Assessment, and Accountability".
Kapitel 5,
sid.
74–99
i
Gabriel Heller Sahlgren, red.,
Tests Worth Teaching to Incentivising Quality in Qualifications and Accountability .
London:
Centre for Market Reform of Education.