Measuring students’ emotions in the early years: The achievement emotions questionnaire-elementary school (AEQ-ES).

Lichtenfeld, S., Pekrun, R., Stupnisky, R. H., Reiss, K., & Murayama, K. (2012). Measuring students' emotions in the early years: The achievement emotions questionnaire-elementary school (AEQ-ES). Learning and Individual Differences, 22(2), 190-201. PDF   Online Article