Sundqvist, P., E. Peters, G. B. Skar, and H. Gyllstad. “Study Protocol: STarting AGe and Extramural English: Learning English in and Outside of School in Norway and Flanders (STAGE)”. Forum for Linguistic Studies, vol. 7, no. 8, Aug. 2025, pp. 793–809, doi:10.30564/fls.v7i8.10412.