Relevant Cost Analysis in Decision Making (Producing Own or Buying From Outside) at Old Bakery: Analisis Biaya Relevan Dalam Pengambilan Keputusan (Memproduksi Sendiri Atau Membeli Dari Luar) Pada Old Bakery. Jurnal Perilaku Bisnis Kontemporer, [S. l.], v. 2, n. 3, p. 155–162, 2025. DOI: 10.62769/1mk1a327. Disponível em: https://journal.sumaterascientist.id/index.php/JUBIKO/article/view/53.. Acesso em: 9 may. 2026.