Asen, A. B., and A. Kaana. “Assessment of Some Heavy Metals Content of Road-Side Vended Food Stuffs in Keffi Metropolis”. The International Journal of Science & Technoledge, vol. 6, no. 4, Apr. 2018, http://www.internationaljournalcorner.com/index.php/theijst/article/view/129687.