Harningsih, T., and W. Wimpy. “Penentuan Kadar Timbal Dalam Darah Operator SPBU Di Kota Karanganyar Berdasarkan Kebiasaan Merokok: Determination of Lead Levels in Blood Operator SPBU in The City of Karanganyar Based on Smoking Habit”. Jurnal Surya Medika (JSM), vol. 6, no. 1, Aug. 2020, pp. 57-62, doi:10.33084/jsm.v6i1.1618.