1. Baird, J. R., & Northfield, J. R. (Eds.). (1992). Learning from the PEEL experience. Monash University Printing.
2. Bartek, M. M. (2002). Paving the road to critical thinking. Understanding Our Gifted, 14(4), 10–12.
3. Bavarian State Ministry for Education and Culture [StMUK] (Ed.). (2004). Lehrplan für das Gymnasium in Bayern [Curriculum for the Bavarian gymnasium]. Kastner.
4. Bond, T. G., & Fox, C. M. (2007). Applying the Rasch model: Fundamental measurement in the human sciences (2nd ed.). Lawrence Erlbaum Associates.
5. Boone, W. J., Staver, J. R., & Yale, M. S. (2014). Rasch analysis in the human sciences. Springer.