Pramita, Heny, et al. “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, vol. 3, no. 1, June 2011, pp. 63-68, https://doi.org/10.30659/sainsmed.v3i1.410.