Trips, Carola/Percillier, Michael/Elter, Wiebke Juliane/Kaltenbach, Lena/Seidel, Lisa (2020): Foreword to the inaugural volume of the Student Edition of Mannheim papers in multilingualism, acquisition and change (MAPMAC). In: Mannheim papers in multilingualism, acquisition and change 1, p. i-iii.