KARTINI ROSMALAH; AGUSTIANINGRUM, Shinta. The Effectiveness of Ruangguru Instagram Account Message as Digital Marketing Communication. Jurnal Spektrum Komunikasi, [S. l.], v. 9, n. 2, p. 162–179, 2021. DOI: 10.37826/spektrum.v9i2.124. Disponível em: https://journal.stikosa-aws.ac.id/index.php/spektrum/article/view/124. Acesso em: 2 nov. 2025.