Azza Hussien, Huda Saad, and Kasem Abdinibi. “Evaluating the Concentration of Heavy Metals in Commercial Coffee: A Comparative Study With Global Safety Levels”. AlQalam Journal of Medical and Applied Sciences (July 19, 2025): 1422–1431. Accessed July 20, 2025. https://www.journal.utripoli.edu.ly/index.php/Alqalam/article/view/1003.