Nasution, Sri Bulan. 2019. “ANALISA KADAR TIMBAL PADA SAYUR KUBIS (Brassica Oleracea L.var. Capitata L) YANG DITANAM DI PINGGIR JALAN TANAH KARO BERASTAGI”. Jurnal Ilmiah PANNMED (Pharmacist, Analyst, Nurse, Nutrition, Midwivery, Environment, Dentist) 8 (3):291-89. https://doi.org/10.36911/pannmed.v8i3.373.