FAHREZA SAEFULLAH FATTAH; MEDIA AGUS KURNIAWAN. ANALISIS CONTRIBUTION MARGIN SEBAGAI ALAT PERENCANAAN LABA USAHA PENJUALAN DAGING SAPI DI KECAMATAN GALANG KABUPATEN DELI SERDANG. Journal of Innovation Research and Knowledge, [S. l.], v. 5, n. 2, p. 2531–2546, 2025. Disponível em: https://bajangjournal.com/index.php/JIRK/article/view/10864. Acesso em: 20 aug. 2025.