Toropainen, Outi, and Sinikka Lahtinen. “Interrogative Clauses across CEFR Levels in Finnish and Swedish As an L2”. Apples - Journal of Applied Language Studies 8, no. 3 (June 27, 2014): 71–84. Accessed May 7, 2024. https://apples.journal.fi/article/view/97873.