“A Comparative Study of Sodium Sulfide and Sodium Hydroxide for Keratin Extraction from Waste Chicken Feathers Based on Response Surface Methodology (RSM)”. Scientific Journal for Faculty of Science-Sirte University 6, no. 1 (April 17, 2026): 16–23. Accessed April 20, 2026. https://journal.su.edu.ly/index.php/jsfsu/article/view/3871.