Hamzah, Maditya Amirul, Tama Rahmandha Zain, Ketut Sumada, and Caecilia Pujiastuti. “Pembuatan Pupuk Kalsium Nitrat Dengan Bahan Baku Cangkang Telur Ayam Dan Asam Nitrat”. Envirous 4, no. 1 (September 4, 2023): 11–16. Accessed December 22, 2024. https://envirous.upnjatim.ac.id/index.php/envirous/article/view/151.