Retnaningsih W, Arif Nugroho, Yunika Triana, Heldy Ramadhan Putra, Ira Mutiaraningrum. Impact of WhatsApp-Integrated Flipped Learning on Developing English Speech Acts of Requests: Students’ Performance, Perception, and Acceptance. kuey [Internet]. 2023 Apr. 20 [cited 2025 Sep. 26];29(2). Available from: https://www.kuey.net/index.php/kuey/article/view/715