Zeitschriftenartikel
Baumert, J.,
Fleckenstein, J.,
Leucht, M.,
Köller, O., &
Möller, J. (2020). The long-term proficiency of early, middle, and late starters learning English as a foreign language at school: A narrative review and empirical study.
Language Learning,
70(4), 1091–1135. https://doi.org/10.1111/lang.12414