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Retnaningsih, Woro, Sujito, Sujito, Muttaqin, Wildan Mahir, Kurniasih, Nuning, Budianto, Langgeng, Ghozali, Imam, Mutohar, Prim Masrokan, Susanto, Djoko, Widodo, Aris and Loka, Adi (2019) The use of WhatsApp to express students confirming speech act strategy to the lecturers. Journal of Physics: Conference Series, 1175 (1). pp. 1-6. ISSN Online ISSN: 1742-6596 Print ISSN: 1742-6588