PISA 2018 Skalenhandbuch Anja Schiepe-Tiska, Kristina Reiss, Julia Mang, Elisabeth Gonzaléz Rodríguez, Lisa Ziernwald, Mirjam Weis, Ludwig Seidl, Ana Tupac-Yupanqui, Anastasia Doroganova, Jennifer Diedrich, Jörg-Henrik Heine