Ahmad, K. B., A. B. Adam, I. A. Bilkisu, F. S. Umar, and A. H. Kahtan. “Assessment of Heavy Metals in Human Scalp Hair”. TROPICAL JOURNAL OF ENGINEERING, SCIENCE AND TECHNOLOGY 3, no. 1 (July 3, 2024): 1–7. Accessed October 12, 2025. http://tjest.org.ng/index.php/journal/article/view/171.