T. Harningsih 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”, J Surya Medika, vol. 6, no. 1, pp. 57–62, Aug. 2020.