SHOLIHIN HASAN; MUHAMMAD HUSAINI; EKO HARYONO. Analisis Spread Gold dalam Pengambilan Keputusan Investasi di Aplikasi Byons by BSI. OPTIMAL Jurnal Ekonomi dan Manajemen, [S. l.], v. 4, n. 4, p. 138–149, 2026. DOI: 10.55606/optimal.v4i4.10635. Disponível em: https://researchhub.id/index.php/optimal/article/view/10635. Acesso em: 13 mar. 2026.