Chaudhry, A.N., G. Jilani, M.A. Khan, and T. Iqbal. 2010. “Improved Processing of Poultry Litter Reduces Nitrate Leaching and Enhances Its Fertilizer Quality”. Asian Journal of Chemistry 21 (7):4997-5003. https://asianpubs.org/index.php/ajchem/article/view/18265.