Arianto, M., and A. H. Ritonga. “ANALISA KADAR Pb PADA RAMBUT TUKANG BECAK SEKITARAN JALAN KAPTEN MUSLIM MEDAN”. JURNAL ANALIS LABORATORIUM MEDIK, vol. 4, no. 1, Sept. 2019, http://114.7.97.221/index.php/ALM/article/view/817.