URL dokumen:
https://prisma.simaster.ugm.ac.id/karya_files/the-reproductive-performance-of-ongole-grade-cows-at-smallholder-farmer-with-different-housing-systems-dcfcd07e645d245babe887e5e2daa016/15ec23de-d168-11ed-97b5-e4434b0aade8