Barus, I.R.G. and Simanjuntak, M.B. (2020) “WHATSAPP GROUP AND GOOGLE CLASSROOM-BASED LEARNING MATERIALS IN ENGLISH CLASSES: STUDENTS’ PERCEPTIONS: (Study Case taken from College of Vocational Studies – IPB University)”, Seltics Journal: Scope of English Language Teaching Literature and Linguistics, 3(1), pp. 47–54. doi:10.46918/seltics.v3i1.552.