Pasaribu, A. N., E. Saragih, and A. Gea. “Politeness in Thesis Consultation by WhatsApp: Do Lecturers and Students Apply Different Strategies? ”. Elsya : Journal of English Language Studies, Vol. 4, no. 1, Nov. 2021, pp. 45-53, doi:10.31849/elsya.v4i1.6376.