Kabiru, S., R. Yakubu, A. Lukman, T. Akintola, M. Alegbemi, and F. Musa. “A Study on Heavy Metal Content of Soil in Garki Area Council of Abuja, Nigeria”. Current Research and Development in Chemistry Vol. 1, Apr. 2020, pp. 72-81, https://stm1.bookpi.org/index.php/crdc-v1/article/view/1184.