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Woro, Retnaningsih and Sujito, Sujito and Wildan Mahir Muttaqin, Wildan and Nuning Kurniasih, Nuning and Budianto, Langgeng and Imam Ghozali, Imam and Prim Masrokan Mutahar, Prim and Djoko Susanto, Susanto and Aris Widodo, Aris and Adi Loka, Adi (2019) The use of WhatsApp to express students confirming speech actstrategy to the lecturers. Presented at 1st International Conference on Advance and Scientific Innovation (ICASI), 2019, Journal of Physics: Conference Series.