Pramita, H. et al. 2011. The Difference in Effectiveness of 70% and 0.5% Chlorine to ReduceThe Germ Number on Stethoscope’s Membrane Experimental research at stethoscope in Baitul Izah Ward of Sultan Agung Islamic Hospital Semarang. Sains Medika: Jurnal Kedokteran dan Kesehatan. 3, 1 (Jun. 2011), 63–68. DOI:https://doi.org/10.30659/sainsmed.v3i1.410.