Kartika Dwi Jayanti, Adhona Bhajana Wijaya Negara. ANALISIS KELAYAKAN USAHA PETERNAKAN SAPI DI SAPI PERKASA FARM KECAMATAN HAMPARAN PERAK KABUPATEN DELI SERDANG. JIRK [Internet]. 2025 Aug. 4 [cited 2025 Aug. 4];5(3):3801-14. Available from: https://bajangjournal.com/index.php/JIRK/article/view/11027