Bahrudin, Dinar Vincy Yunitaka. “Improving Students’ Speaking Ability on Expressing Plan through Problem Based Learning (PBL) Method”. OKARA: Jurnal Bahasa dan Sastra 12, no. 2 (October 31, 2018): 271-278. Accessed July 17, 2024. https://ejournal.iainmadura.ac.id/index.php/okara/article/view/2086.