Assalamah, Tuhfatul. “The Influence of Brand Ambassador Iqbaal Ramadhan on Parental Decisions in the Digital Community of East Java Smart Parents in Choosing Ruangguru As a Children’s Online Tutoring Media”. The Commercium 3, no. 02 (September 1, 2020): 1-5. Accessed May 6, 2024. https://ejournal.unesa.ac.id/index.php/Commercium/article/view/36275.