Dewi NR, Hartoyo I, Natalia CH. Integrating the case method approach in 21st century teaching: Empowering the development of effective and innovative teaching instruments. J. appl. linguist. lit. [Internet]. 2024 Apr. 7 [cited 2025 Jul. 2];9(1):222-40. Available from: https://ejournal.unib.ac.id/joall/article/view/30061