PUTRI, Natasya Adelia. STUDENTS’ PERCEPTIONS ON CHALLENGES OF THE USE OF ZOOM AND WHATSAPP AS SYNCHRONOUS AND ASYNCHRONOUS ONLINE LEARNING PLATFORMS IN SENIOR HIGH SCHOOL. RETAIN : Journal of Research in English Language Teaching, [S. l.], v. 11, n. 02, p. 95–103, 2023. Disponível em: https://ejournal.unesa.ac.id/index.php/retain/article/view/47401. Acesso em: 22 aug. 2025.