Millenia, Arum, and Rita Ambarwati Sukmono. 2023. “Strengthening the Umama Brand Promotion Strategy on the Decision to Purchase Instant Hijab Products Among Students in the Sidoarjo Region”. Indonesian Journal of Innovation Studies 21 (January), 10.21070/ijins.v21i.766. https://doi.org/10.21070/ijins.v21i.766.