Widiasmadi, Nugroho. “Konservasi Lahan Melalui Katalisa Unsur Makro Organik Cair N-P-K”. Jurnal Pendidikan dan Konseling (JPDK) 4, no. 5 (September 23, 2022): 2526–2537. Accessed January 15, 2025. https://journal.universitaspahlawan.ac.id/index.php/jpdk/article/view/6996.