Hendrowati, Heny, Iskandar, and Elly Fatmasari. “Elaboration of Transactional Conversation for Middle-School Students: Speaking Skills Through ‘COIN-SPA’ Learning”. ETDC: Indonesian Journal of Research and Educational Review 3, no. 1 (December 27, 2023): 71–78. Accessed April 24, 2025. https://etdci.org/journal/ijrer/article/view/370.