Chand, Amir, N. K. Sen, and S. Singh. “Determination of Ammonium Sulphate in Ammonia Alum by Formaldehyde Reaction”. Defence Science Journal 12, no. 1 (March 29, 2014): 68–78. Accessed June 15, 2025. https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/6836.