Different approaches to measure teacher's pedagogical content knowledge

E.J. Rohaan, R. Taconis, W.M.G. Jochems, K. Lange, T. Kleickmann, K. Moeller, S. Schmelzing, S. Wuesten, A. Sandmann, B. Neuhaus, J. Riese, P. Reinhold, J. Olszewski, K. Neumann, H.E. Fischer