1. Abell, S. K. (2008). Twenty years later: Does pedagogical content knowledge remain a useful idea? International Journal of Science Education, 30, 1405–1416.
2. Allen, M. J. & Yen, W. M. (2002). Introduction to measurement theory. Long Grove: Waveland.
3. Anderson, J. R. (1981). Cognitive skills and their acquisition. Hillsdale: Lawrence Erlbaum.
4. Schmelzing, S. (2010). Das fachdidaktische Wissen von Biologielehrkräften: Konzeptionalisierung, Diagnostik, Struktur und Entwicklung im Rahmen der Biologielehrerbildung. [Pedagogical content knowledge of biology teachers: conceptualization, diagnostics, structure and development within biology teacher education]. Berlin: Logos.
5. van Driel, J. H., Verloop, N. & de Vos, W. (1998). Developing science teachers' pedagogical content knowledge. Journal of Research in Science Teaching, 35, (6), 673–695.