HAMZAH, M. A. .; ZAIN, T. R.; SUMADA, K. .; PUJIASTUTI, C. Pembuatan Pupuk Kalsium Nitrat Dengan Bahan Baku Cangkang Telur Ayam Dan Asam Nitrat. Envirous, [S. l.], v. 4, n. 1, p. 11–16, 2023. Disponível em: https://envirous.upnjatim.ac.id/index.php/envirous/article/view/151. Acesso em: 12 may. 2024.