Abdullah, Hasan Zuhudi, and Nurdiana Azlan Hisham. 2023. “The Effect of Hydrochloric Acid to The Extraction of Gelatin from Salmon Skin”. Research Progress in Mechanical and Manufacturing Engineering 4 (1): 270-76. https://publisher.uthm.edu.my/periodicals/index.php/rpmme/article/view/9120.