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, vol. 3, no. 1, July 2024, pp. 1-7, http://tjest.org.ng/index.php/journal/article/view/171.