“ANALISIS MARGINAL REVENUE PRODUKSI TELUR AYAM LOKAL PADA USAHA AYAM PETELUR BAPAK MUSU BUNGA”. 2018. JURNAL ULET (Utility, Earning and Tax) 2 (2): 5. http://ejournal.stiejb.ac.id/index.php/jurnal-ulet/article/view/24.