"A Comparative Study of Sodium Sulfide and Sodium Hydroxide for Keratin Extraction from Waste Chicken Feathers Based on Response Surface Methodology (RSM)". المجلة العلمية لكلية العلوم, م 6, عدد 1, أبريل، 2026, ص 16-23, https://doi.org/10.37375/9t5jaj98.