Hamzah MA, Zain TR, Sumada K, Pujiastuti C. Pembuatan Pupuk Kalsium Nitrat Dengan Bahan Baku Cangkang Telur Ayam Dan Asam Nitrat. envirous [Internet]. 2023Sep.4 [cited 2024May12];4(1):11-6. Available from: https://envirous.upnjatim.ac.id/index.php/envirous/article/view/151