SAKTI, B. Retno Pratiwi. Evaluate the Effectiveness of Promotions in Optimizing Purchase Decisions. Spectrum: Multidisciplinary Journal, [S. l.], v. 1, n. 2, p. 94–98, 2024. Disponível em: https://journals.sanusantara.com/index.php/spectrum/article/view/39. Acesso em: 26 sep. 2026.