Arianto, Maniur, and Ahmad Hafizullah Ritonga. 2019. “ANALISA KADAR Pb PADA RAMBUT TUKANG BECAK SEKITARAN JALAN KAPTEN MUSLIM MEDAN”. JURNAL ANALIS LABORATORIUM MEDIK 4 (1). http://114.7.97.221/index.php/ALM/article/view/817.