Siregar, Christina Anita Elizabeth, et al. “The Effect Of Whatsapp Teaching Media To The Reading Comprehension On A Narrative Text At SMP Negeri 4 Pematangsiantar”. Innovative: Journal Of Social Science Research, vol. 4, no. 5, Sept. 2024, pp. 2086-99, doi:10.31004/innovative.v4i5.15208.