Hidayati, Reny. “ANALISIS EFISIENSI TEKNIS USAHATANI KUBIS DI KABUPATEN AGAM, SUMATERA BARAT”. Jurnal Hexagro 2, no. 1 (February 28, 2018). Accessed May 11, 2024. https://e-journal.unper.ac.id/index.php/hexagro/article/view/114.